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Solutions for Computer Applications, Class 10, ICSE
What is sequential flow of control? Explain with an example.
In sequential flow of control, the statements of a program are executed from top to bottom in order in which they are written including method calls. During execution, the control is transferred to the method called. The method is then executed in a sequential order and upon its completion, the control is transferred back to the calling method and execution of statements continues sequentially. For example, the following program will be executed in a sequential manner:
public class SequentialExample {
static void showGreeting() {
System.out.println("Welcome to KnowledgeBoat");
}
public static void main(String args[]) {
System.out.println("Sequential Execution Program Example");
showGreeting();
}
}What is conditional flow of control? Explain with an example.
By default, the statements of a program are executed sequentially from top to bottom in order in which they are written. But most of the times our programs require to alter this top to bottom control flow based on some condition. When the flow of control of a program is changed based on some condition using control statements, it is termed conditional flow of control. For example, in the below program we achieve conditional flow of control using the if-else statement.
public class ConditionalExample {
public static void main(String args[]) {
int x = -10;
if (x >= 0) {
System.out.println("Positive Number");
}
else {
System.out.println("Negative Number");
}
}
}Explain the significance of break statement in the switch statement.
The break statement is used inside the switch statement to terminate a statement block. It brings the program control out of the switch statement.
What is a fall through? Give an example.
break statement at the end of case is optional. Omitting break leads to program execution continuing into the next case and onwards till a break statement is encountered or end of switch is reached. This is termed as fall through. For example, consider the below program:
public class FallThroughExample {
public static void main(String args[]) {
int number = 1;
switch(number) {
case 0:
System.out.println("Value of number is zero");
case 1:
System.out.println("Value of number is one");
case 2:
System.out.println("Value of number is two");
default:
System.out.println("Value of number is greater than two");
}
System.out.println("End of switch");
}
}Its output when executed will be:
Value of number is one
Value of number is two
Value of number is greater than two
End of switch
Explain the significance of the default label in the switch statement.
When none of the case values are equal to the expression of switch statement then default case is executed. In the example below, value of number is 4 so case 0, case 1 and case 2 are not equal to number. Hence println statement of default case will get executed printing "Value of number is greater than two" to the console.
int number = 4;
switch(number) {
case 0:
System.out.println("Value of number is zero");
break;
case 1:
System.out.println("Value of number is one");
break;
case 2:
System.out.println("Value of number is two");
break;
default:
System.out.println("Value of number is greater than two");
break;
}Value of number is greater than two
Explain the use of System.exit(n) method in Java.
The currently running program can be terminated with the help of the exit() method of the System class - System.exit(n). The argument n serves as a status code. A non-zero status code indicates abnormal termination, and a zero status code indicates a normal termination.
Format the following if statements with indentation:
i. if (x == y) if (x == z) x = 1; else y = 1; else z = 1;
if (x == y)
if (x == z)
x = 1;
else
y = 1;
else
z = 1;ii. if (x == y) {if (y == z) x = 1; y = 2; } else z = 1;
if (x == y)
{
if (y == z)
x = 1;
y = 2;
}
else
z = 1;iii. if (num1 != num2) {
if (num2 >= num3) x = 1; y = 2; }
else {x = 1; if (num1 == num2) z = 3;}
if (num1 != num2)
{
if (num2 >= num3)
x = 1;
y = 2;
}
else
{
x = 1;
if (num1 == num2)
z = 3;
}Rewrite the following if statement, using the switch statement:
if (choice == 1)
System.out.println("You selected One");
else if (choice == 2)
System.out.println("You selected Two");
else if (choice == 3)
System.out.println("You selected Three");
else if (choice == 4)
System.out.println("You selected Four");
else if (choice == 5)
System.out.println("You selected Five");
else if (choice == 6)
System.out.println("You selected Six");
else
System.out.println("Invalid choice");switch (choice) {
case 1:
System.out.println("You selected One");
break;
case 2:
System.out.println("You selected Two");
break;
case 3:
System.out.println("You selected Three");
break;
case 4:
System.out.println("You selected Four");
break;
case 5:
System.out.println("You selected Five");
break;
case 6:
System.out.println("You selected Six");
break;
default:
System.out.println("Invalid choice");
}Write the following switch statement by using nested if statements:
switch (choice)
{
case 0:
case 1:
x = 111;
y = 222;
break;
case 2:
x = 333;
y = 444;
break;
case 3:
x = -11;
y = -22;
break;
default:
y = 555;
}if (choice == 0 || choice == 1)
{
x = 111;
y = 222;
}
else
{
if (choice == 2)
{
x = 333;
y = 444;
}
else
{
if (choice == 3)
{
x = -11;
y = -22;
}
else
{
y = 555;
}
}
}Write an if statement to find the smallest of the three given integers using the min() method of the Math class.
if (a < Math.min(b, c))
System.out.println(a);
else
System.out.println(Math.min(b, c));Find the error in the given statement:
int x = (a => b) ? "a" : "b";String x = (a >= b) ? "a" : "b";Find the error, if any, in the following code. Write the correct statement.
int a=5, b=10;
int x = (a>b)>true:false;int a=5, b=10;
boolean x = (a>b) ? true:false;Rewrite the following statement using if else:
int max=215, min=323;
String str= (max>min) ? "Max is greater than Min" : "Min is Greater than Max";int max=215, min=323;
String str="";
if (max > min)
str = "Max is greater than Min";
else
str = "Min is Greater than Max";What will be the value of 'n' after the execution of the code given below?
int x=2, m=1, c=-1;
int n = x + c;
n = n - c + x;
System.out.println(n);n will be 4 after execution of the code.
First n = x + c is executed ⇒ n = 2 + (-1) = 1.
Next, n = n - c + x is executed.
n = n - c + x
⇒ n = 1 - (-1) + 2
⇒ n = 4
So final value of n is 4.
What will be the output of the following code?
int x=2,y=5,a=0;
a=x;
x=y;
y=a;
System.out.println("x=" + x + " y=" + y);Output is:
x=5 y=2
This code is swapping the values of x and y.
Find the errors in the following code and rewrite the correct version:
char m="A";
Switch ("A");
{
Case 'a';
System.out.println("A");
break;
Case 'b';
System.out.println("B");
break;
Default:
System.out.println("Not a valid option");
}The code has the following errors:
Corrected Version:
char m = 'A';
switch (m) {
case 'a':
System.out.println("A");
break;
case 'b':
System.out.println("B");
break;
default:
System.out.println("Not a valid option");
}Write a program to find the number of and sum of all integers greater than 500 and less than 1000 that are divisible by 17
public class KboatDivisibleBy17
{
public static void main(String args[]) {
int sum = 0, count = 0;
for (int i = 501; i < 1000; i++) {
if (i % 17 == 0) {
count++;
sum += i;
}
}
System.out.println("Sum = " + sum);
System.out.println("Count = " + count);
}
}
Create a program to find out if the number entered by the user is a two, three or four digits number.
Sample input: 1023
Sample output: 1023 is a 4 digit number.
import java.util.Scanner;
public class KboatNumber
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("Enter number: ");
int n = in.nextInt();
if (n >= 10 && n <= 99)
System.out.println("Two Digit Number");
else if (n >= 100 && n <= 999)
System.out.println("Three Digit Number");
else if (n >= 1000 && n <= 9999)
System.out.println("Four Digit Number");
else
System.out.println("Please enter a 2, 3 or 4 digit number");
}
}
Write a program in Java that reads a word and checks whether it begins with a vowel or not.
import java.util.Scanner;
public class KboatWord
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("Enter a word: ");
String w = in.nextLine();
char ch = w.charAt(0);
ch = Character.toUpperCase(ch);
if (ch == 'A' ||
ch == 'E' ||
ch == 'I' ||
ch == 'O' ||
ch == 'U')
System.out.println("Word begins with a vowel");
else
System.out.println("Word does not begin with a vowel");
}
}
Write a program in Java to read three integers and display them in descending order.
import java.util.Scanner;
public class KboatDescending
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("Enter first number: ");
int a = in.nextInt();
System.out.print("Enter second number: ");
int b = in.nextInt();
System.out.print("Enter third number: ");
int c = in.nextInt();
int max = -1, mid = -1, min = -1;
if (a > b) {
if (a > c) {
max = a;
if (b > c) {
mid = b;
min = c;
}
else {
mid = c;
min = b;
}
}
else {
max = c;
mid = a;
min = b;
}
}
else {
if (b > c) {
max = b;
if (a > c) {
mid = a;
min = c;
}
else {
{
mid = c;
min = a;
}
}
}
else {
max = c;
mid = b;
min = a;
}
}
System.out.println("Numbers in Descending order:");
System.out.println(max + " " + mid + " " + min);
}
}
Using the ternary operator, create a program to find the largest of three numbers.
import java.util.Scanner;
public class KboatLargestNumber
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("Enter first number: ");
int a = in.nextInt();
System.out.print("Enter second number: ");
int b = in.nextInt();
System.out.print("Enter third number: ");
int c = in.nextInt();
int max = a > b ? a : b;
max = max > c ? max : c;
System.out.print("Largest Number = " + max);
}
}
Write a program that reads a month number and displays it in words.
import java.util.Scanner;
public class KboatMonthInWords
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("Enter month number: ");
int n = in.nextInt();
switch(n) {
case 1:
System.out.println("January");
break;
case 2:
System.out.println("Feburary");
break;
case 3:
System.out.println("March");
break;
case 4:
System.out.println("April");
break;
case 5:
System.out.println("May");
break;
case 6:
System.out.println("June");
break;
case 7:
System.out.println("July");
break;
case 8:
System.out.println("August");
break;
case 9:
System.out.println("September");
break;
case 10:
System.out.println("October");
break;
case 11:
System.out.println("November");
break;
case 12:
System.out.println("December");
break;
default:
System.out.println("Wrong month number");
break;
}
}
}
Admission in a professional course is subject to the following criteria:
Write a program in Java to accept marks in these 3 subjects (Physics, Chemistry, and Mathematics) and display if a candidate is eligible.
import java.util.Scanner;
public class KboatAdmission
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("Enter marks in Physics: ");
int p = in.nextInt();
System.out.print("Enter marks in Chemistry: ");
int c = in.nextInt();
System.out.print("Enter marks in Mathematics: ");
int m = in.nextInt();
int t = p + c + m;
int pm = p + m;
if (p >= 70 && c >= 60 && m >= 70
&& (t >= 225 || pm >= 150))
System.out.println("Eligible");
else
System.out.println("Not Eligible");
}
}
Using the switch statement in Java, write a program to display the name of the city according to the user's choice.
D — Delhi, M — Mumbai, K — Kolkata, C — Chennai
import java.util.Scanner;
public class KboatCityName
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("Enter your choice: ");
char ch = in.next().charAt(0);
switch (ch) {
case 'D':
System.out.println("Delhi");
break;
case 'M':
System.out.println("Mumbai");
break;
case 'K':
System.out.println("Kolkata");
break;
case 'C':
System.out.println("Chennai");
break;
default:
System.out.println("Invalid choice");
}
}
}
Write a program that will read the value of x and compute the following function:
import java.util.Scanner;
public class KboatFunction
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("Enter x: ");
int x = in.nextInt();
int y = -1;
if (x > 0)
y = 7;
else if (x == 0)
y = 0;
else
y = -7;
System.out.println("y=" + y);
}
}
Employees at Arkenstone Consulting earn the basic hourly wage of Rs.500. In addition to this, they also receive a commission on the sales they generate while tending the counter. The commission given to them is calculated according to the following table:
| Total Sales | Commmision Rate |
|---|---|
| Rs. 100 to less than Rs. 1000 | 1% |
| Rs. 1000 to less than Rs. 10000 | 2% |
| Rs. 10000 to less than Rs. 25000 | 3% |
| Rs. 25000 and above | 3.5% |
Write a program in Java that inputs the number of hours worked and the total sales. Compute the wages of the employees.
import java.util.Scanner;
public class KboatArkenstoneConsulting
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("Enter number of hours: ");
int hrs = in.nextInt();
System.out.print("Enter total sales: ");
int sales = in.nextInt();
double wage = hrs * 500;
double c = 0;
if (sales < 100)
c = 0;
else if (sales < 1000)
c = 1;
else if (sales < 10000)
c = 2;
else if (sales < 25000)
c = 3;
else
c = 3.5;
double comm = c * sales / 100.0;
wage += comm;
System.out.println("Wage = " + wage);
}
}
Write a program in Java to compute the perimeter and area of a triangle, with its three sides given as a, b, and c using the following formulas:
import java.util.Scanner;
public class KboatTriangle
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("Enter first side: ");
double a = in.nextDouble();
System.out.print("Enter second side: ");
double b = in.nextDouble();
System.out.print("Enter third side: ");
double c = in.nextDouble();
double perimeter = a + b + c;
double s = perimeter / 2;
double area = Math.sqrt(s * (s - a) * (s - b) * (s - c));
System.out.println("Perimeter = " + perimeter);
System.out.println("Area = " + area);
}
}
Mayur Transport Company charges for parcels as per the following tariff:
| Weight | Charges |
|---|---|
| Upto 10 Kg. | Rs. 30 per Kg. |
| For the next 20 Kg. | Rs. 20 per Kg. |
| Above 30 Kg. | Rs. 15 per Kg. |
Write a program in Java to calculate the charge for a parcel, taking the weight of the parcel as an input.
import java.util.Scanner;
public class KboatMayurTpt
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("Enter parcel weight: ");
double wt = in.nextDouble();
double amt = 0;
if (wt <= 10)
amt = 30 * wt;
else if (wt <= 30)
amt = 300 + ((wt - 10) * 20);
else
amt = 300 + 400 + ((wt - 30) * 15);
System.out.println("Parcel Charge = " + amt);
}
}
Create a program in Java to find out if a number entered by the user is a Duck Number.
A Duck Number is a number which has zeroes present in it, but there should be no zero present in the beginning of the number. For example, 6710, 8066, 5660303 are all duck numbers whereas 05257, 080009 are not.
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class KboatDuckNumber
{
public void duckNumberCheck() throws IOException {
InputStreamReader reader = new InputStreamReader(System.in);
BufferedReader in = new BufferedReader(reader);
System.out.print("Enter number: ");
boolean isDuck = false;
boolean firstZero = false;
int c = 0, d;
/*
* 10 is the ASCII code of newline
* We will read from inputstream
* one character at a time till we
* encounter a newline i.e. enter
*/
while((d = in.read()) != 10) {
char ch = (char)d;
if (c == 0 && ch == '0' )
firstZero = true;
if (!firstZero && ch == '0')
isDuck = true;
c++;
}
if (isDuck)
System.out.println("Duck Number");
else
System.out.println("Not a Duck Number");
}
}
The electricity board charges the bill according to the number of units consumed and the rate as given below:
| Units Consumed | Rate Per Unit |
|---|---|
| First 100 units | 80 Paisa per unit |
| Next 200 units | Rs. 1 per unit |
| Above 300 units | Rs. 2.50 per unit |
Write a program in Java to accept the total units consumed by a customer and calculate the bill. Assume that a meter rent of Rs. 500 is charged from the customer.
import java.util.Scanner;
public class KboatElectricBill
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("Enter Units Consumed: ");
int units = in.nextInt();
double amt = 0.0;
if (units <= 100)
amt = units * 0.8;
else if (units <= 300)
amt = (100 * 0.8) + ((units - 100) * 1);
else
amt = (100 * 0.8) + (200 * 1.0) + ((units - 300) * 2.5);
amt += 500;
System.out.println("Units Consumed: " + units);
System.out.println("Bill Amount: " + amt);
}
}
Write a menu driven program to accept a number from the user and check whether it is a Buzz number or an Automorphic number.
i. Automorphic number is a number, whose square's last digit(s) are equal to that number. For example, 25 is an automorphic number, as its square is 625 and 25 is present as the last two digits.
ii. Buzz number is a number, that ends with 7 or is divisible by 7.
import java.util.Scanner;
public class KboatBuzzAutomorphic
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.println("1. Buzz number");
System.out.println("2. Automorphic number");
System.out.print("Enter your choice: ");
int choice = in.nextInt();
System.out.print("Enter number: ");
int num = in.nextInt();
switch (choice) {
case 1:
if (num % 10 == 7 || num % 7 == 0)
System.out.println(num + " is a Buzz Number");
else
System.out.println(num + " is not a Buzz Number");
break;
case 2:
int sq = num * num;
int d = 0;
int t = num;
/*
* Count the number of
* digits in num
*/
while(t > 0) {
d++;
t /= 10;
}
/*
* Extract the last d digits
* from square of num
*/
int ld = (int)(sq % Math.pow(10, d));
if (ld == num)
System.out.println(num + " is automorphic");
else
System.out.println(num + " is not automorphic");
break;
default:
System.out.println("Incorrect Choice");
break;
}
}
}
Write a Java program in which you input students name, class, roll number, and marks in 5 subjects. Find out the total marks, percentage, and grade according to the following table.
| Percentage | Grade |
|---|---|
| >=90 | A+ |
| >=80 and <90 | A |
| >=70 and <80 | B+ |
| > =60 and <70 | B |
| >=50 and <60 | C |
| >=40 and <50 | D |
| <40 | E |
import java.util.Scanner;
public class KboatStudentGrades
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("Enter name of student: ");
String n = in.nextLine();
System.out.print("Enter class of student: ");
int c = in.nextInt();
System.out.print("Enter roll no of student: ");
int r = in.nextInt();
System.out.print("Enter marks in 1st subject: ");
int m1 = in.nextInt();
System.out.print("Enter marks in 2nd subject: ");
int m2 = in.nextInt();
System.out.print("Enter marks in 3rd subject: ");
int m3 = in.nextInt();
System.out.print("Enter marks in 4th subject: ");
int m4 = in.nextInt();
System.out.print("Enter marks in 5th subject: ");
int m5 = in.nextInt();
int t = m1 + m2 + m3 + m4 + m5;
double p = t / 500.0 * 100.0;
String g = "";
if (p >= 90)
g = "A+";
else if (p >= 80)
g = "A";
else if (p >=70)
g = "B+";
else if (p >= 60)
g = "B";
else if (p >= 50)
g = "C";
else if (p >= 40)
g = "D";
else
g = "E";
System.out.println("Total Marks = " + t);
System.out.println("Percentage = " + p);
System.out.println("Grade = " + g);
}
}
Write a program in Java to accept three numbers and check whether they are Pythagorean Triplet or not. The program must display the message accordingly. [Hint: h2=p2+b2]
import java.util.Scanner;
public class KboatPythagoreanTriplet
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("Enter 1st number: ");
int a = in.nextInt();
System.out.print("Enter 2nd number: ");
int b = in.nextInt();
System.out.print("Enter 3rd number: ");
int c = in.nextInt();
if (a * a + b * b == c * c ||
a * a + c * c == b * b ||
b * b + c * c == a * a)
System.out.println("Pythagorean Triplets");
else
System.out.println("Not Pythagorean Triplets");
}
}
Using switch case, write a program to convert temperature from Fahrenheit to Celsius and Celsius to Fahrenheit.
Fahrenheit to Celsius formula: (32°F - 32) x 5/9
Celsius to Fahrenheit formula: (0°C x 9/5) + 32
import java.util.Scanner;
public class KboatTemperature
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.println("Type 1 for Fahrenheit to Celsius");
System.out.println("Type 2 for Celsius to Fahrenheit");
int choice = in.nextInt();
double ft = 0.0, ct = 0.0;
switch (choice) {
case 1:
System.out.print("Enter temperature in Fahrenheit: ");
ft = in.nextDouble();
ct = (ft - 32) * 5 / 9.0;
System.out.println("Temperature in Celsius: " + ct);
break;
case 2:
System.out.print("Enter temperature in Celsius: ");
ct = in.nextDouble();
ft = 9.0 / 5.0 * ct + 32;
System.out.println("Temperature in Fahrenheit: " + ft);
break;
default:
System.out.println("Incorrect Choice");
break;
}
}
}
Star mall is offering discount on various types of products purchased by its customers. Following table shows different type of products and their respective code along with the discount offered. Based on the code entered, the mall is calculating the total amount after deducting the availed discount. Create a program to calculate total amount to be paid by the customer.
| Item | Item Code | Discount |
|---|---|---|
| Laptop | L | 5% |
| LCD | D | 7% |
| XBox | X | 10% |
| Printer | P | 11% |
import java.util.Scanner;
public class KboatStarMall
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("Enter purchase amount: ");
double amt = in.nextDouble();
System.out.print("Enter item code: ");
char code = in.next().charAt(0);
int d = 0;
switch (code) {
case 'L':
d = 5;
break;
case 'D':
d = 7;
break;
case 'X':
d = 10;
break;
case 'P':
d = 11;
break;
default:
System.out.println("Invalid Item Code");
}
double disc = amt * d / 100.0;
double total = amt - disc;
System.out.println("Total amount payable = " + total);
}
}
A cloth showroom has announced the following festival discounts on the purchase of items based on the total cost of the items purchased:
| Total Cost | Discount Rate |
|---|---|
| Less than Rs. 2000 | 5% |
| Rs. 2000 to less than Rs. 5000 | 25% |
| Rs. 5000 to less than Rs. 10,000 | 35% |
| Rs. 10,000 and above | 50% |
Write a program to input the total cost and to compute and display the amount to be paid by the customer availing the the discount.
import java.util.Scanner;
public class KboatClothDiscount
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("Enter total cost: ");
double cost = in.nextDouble();
double amt;
if (cost < 2000) {
amt = cost - (cost * 5 / 100.0);
}
else if (cost < 5000) {
amt = cost - (cost * 25 / 100.0);
}
else if (cost < 10000) {
amt = cost - (cost * 35 / 100.0);
}
else {
amt = cost - (cost * 50 / 100.0);
}
System.out.println("Amount to be paid: " + amt);
}
}
A cloth manufacturing company offers discounts to the dealers and retailers. The discount is computed using the length of the cloth as per the following table:
| Length of cloth | Dealer's Discount | Retailer's Discount |
|---|---|---|
| Up to 1000 meters | 20% | 15% |
| Above 1000 meters but less than 2000 meters | 25% | 20% |
| More than 2000 meters | 35% | 25% |
Write a program in Java to input the length of the cloth and the total amount of purchase. The program should display a menu to accept type of customer — Dealer (D) or Retailer (R) and print the amount to be paid. Display a suitable error message for a wrong choice.
import java.util.Scanner;
public class KboatDiscount
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("Enter Cloth length: ");
int l = in.nextInt();
System.out.print("Enter Total Amount of purchase: ");
double a = in.nextDouble();
System.out.println("Enter D for Dealer: ");
System.out.println("Enter R for Retailer: ");
System.out.print("Enter customer type: ");
char type = in.next().charAt(0);
type = Character.toUpperCase(type);
int d = 0;
switch (type) {
case 'D':
if (l <= 1000)
d = 20;
else if (l <= 2000)
d = 25;
else
d = 35;
break;
case 'R':
if (l <= 1000)
d = 15;
else if (l <= 2000)
d = 20;
else
d = 25;
break;
default:
System.out.println("Wrong choice");
}
double disc = a * d / 100.0;
double amt = a - disc;
System.out.println("Amount to be paid = " + amt);
}
}
Using switch case statement in Java, create a program to convert rupee into dollar and dollar into rupee according to the user's choice. Assume conversion price: 1 Dollar = Rs.77.
import java.util.Scanner;
public class KboatRupeeDollar
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.println("Type 1 for Rupee to Dollar conversion: ");
System.out.println("Type 2 for Dollar to Rupee conversion: ");
System.out.print("Enter your choice: ");
int choice = in.nextInt();
switch (choice) {
case 1:
System.out.print("Enter rupee amount: ");
double r1 = in.nextDouble();
double d1 = r1 / 77;
System.out.println(r1 + " rupees => " + d1 + " dollars");
break;
case 2:
System.out.print("Enter dollar amount: ");
double d2 = in.nextDouble();
double r2 = d2 * 77;
System.out.println(d2 + " dollars => " + r2 + " rupees");
break;
default:
System.out.println("Incorrect Choice");
}
}
}
A box of cookies can hold 24 cookies, and a container can hold 75 boxes of cookies. Write a program that prompts the user to enter the total number of cookies, the number of cookies in each box, and the number of cookies boxes in a container. The program then outputs the number of boxes and the number of containers required to ship the cookies.
import java.util.Scanner;
public class KboatCookies
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("Enter total no. of cookies: ");
int cookieCount = in.nextInt();
System.out.print("Enter no. of cookies per box: ");
int cookiePerBox = in.nextInt();
System.out.print("Enter no. of boxes per container: ");
int boxPerContainer = in.nextInt();
int numBox = cookieCount / cookiePerBox;
if (cookieCount % cookiePerBox != 0)
numBox++;
int numContainer = numBox / boxPerContainer;
if (cookieCount % cookiePerBox != 0)
numContainer++;
System.out.println("No. of boxes = " + numBox);
System.out.println("No. of containers = " + numContainer);
}
}
Write a menu driven program to display the following menu:
Conversion Table
============
For an incorrect choice, display an appropriate error message.
Hint: 1 second = 1000 milliseconds
import java.util.Scanner;
public class KboatTimeConversion
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.println("Conversion Table");
System.out.println("================");
System.out.println("1. Milliseconds to Seconds");
System.out.println("2. Milliseconds to Minutes");
System.out.println("3. Seconds to Milliseconds");
System.out.println("4. Seconds to Minutes");
System.out.println("5. Minutes to Milliseconds");
System.out.println("6. Minutes to Seconds");
System.out.print("Enter your choice: ");
int choice = in.nextInt();
double ip = 0, op = 0;
switch (choice) {
case 1:
System.out.print("Enter Milliseconds: ");
ip = in.nextDouble();
op = ip / 1000;
System.out.println("Seconds = " + op);
break;
case 2:
System.out.print("Enter Milliseconds: ");
ip = in.nextDouble();
op = ip / 1000 / 60;
System.out.println("Minutes = " + op);
break;
case 3:
System.out.print("Enter Seconds: ");
ip = in.nextDouble();
op = ip * 1000;
System.out.println("Milliseconds = " + op);
break;
case 4:
System.out.print("Enter Seconds: ");
ip = in.nextDouble();
op = ip / 60;
System.out.println("Minutes = " + op);
break;
case 5:
System.out.print("Enter Minutes: ");
ip = in.nextDouble();
op = ip * 60 * 1000;
System.out.println("Milliseconds = " + op);
break;
case 6:
System.out.print("Enter Minutes: ");
ip = in.nextDouble();
op = ip * 60;
System.out.println("Seconds = " + op);
break;
default:
System.out.println("Incorrect choice");
}
}
}
Using the switch statement, write a menu driven program:
import java.util.Scanner;
public class KboatNumber
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.println("Type 1 for Composite Number");
System.out.println("Type 2 for Smallest Digit");
System.out.print("Enter your choice: ");
int ch = in.nextInt();
switch (ch) {
case 1:
System.out.print("Enter Number: ");
int n = in.nextInt();
int c = 0;
for (int i = 1; i <= n; i++) {
if (n % i == 0)
c++;
}
if (c > 2)
System.out.println("Composite Number");
else
System.out.println("Not a Composite Number");
break;
case 2:
System.out.print("Enter Number: ");
int num = in.nextInt();
int s = 10;
while (num != 0) {
int d = num % 10;
if (d < s)
s = d;
num /= 10;
}
System.out.println("Smallest digit is " + s);
break;
default:
System.out.println("Wrong choice");
}
}
}
A new taxi service based on electric vehicles is offering services within a metro city. Following is the fare chart including the type of taxi used to commute and price per kilometer. Create a program to calculate total fare depending on the distance travelled in kilometers.
| Type | Fare |
|---|---|
| Micro | 10.05/Km |
| Macro | 15.05/Km |
| Shared | 7.05/Km |
import java.util.Scanner;
public class KboatTaxi
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.println("Type 1 for Micro Taxi");
System.out.println("Type 2 for Macro Taxi");
System.out.println("Type 3 for Shared Taxi");
System.out.print("Enter Taxi Type: ");
int ch = in.nextInt();
System.out.print("Enter distance travelled: ");
int dist = in.nextInt();
double fare = 0;
switch (ch) {
case 1:
fare = 10.05;
break;
case 2:
fare = 15.05;
break;
case 3:
fare = 7.05;
break;
default:
System.out.println("Wrong choice");
}
double totalFare = fare * dist;
System.out.println("Total Fare = " + totalFare);
}
}
The City Library charges late fine from members if the books were not returned on time as per the following table:
| Number of days late | Magazines fine per day | Text books fine per day |
|---|---|---|
| Up to 5 days | Rs. 1 | Rs. 2 |
| 6 to 10 days | Rs. 2 | Rs. 3 |
| 11 to 15 days | Rs. 3 | Rs. 4 |
| 16 to 20 days | Rs. 5 | Rs. 6 |
| More than 20 days | Rs. 6 | Rs. 7 |
Using the switch statement, write a program in Java to input name of person, number of days late and type of book — 'M' for Magazine and 'T' for Text book. Compute the total fine and display it along with the name of the person.
import java.util.Scanner;
public class KboatLibrary
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.print("Enter name: ");
String name = in.nextLine();
System.out.print("Days late: ");
int days = in.nextInt();
System.out.println("Type M for Magazine");
System.out.println("Type T for Text book");
System.out.print("Enter book type: ");
char type = in.next().charAt(0);
int fine = 0;
switch (type) {
case 'M':
if (days <= 5)
fine = 1;
else if (days <= 10)
fine = 2;
else if (days <= 15)
fine = 3;
else if (days <= 20)
fine = 5;
else
fine = 6;
break;
case 'T':
if (days <= 5)
fine = 2;
else if (days <= 10)
fine = 3;
else if (days <= 15)
fine = 4;
else if (days <= 20)
fine = 6;
else
fine = 7;
break;
default:
System.out.println("Invalid book type");
}
int totalFine = fine * days;
System.out.println("Name: " + name);
System.out.println("Total Fine: " + totalFine);
}
}
Which of the following are conditional constructs?
Which operator cannot be used with if-else statement?
What will be the output of the following code?
int size = 2;
if (size < 0)
System.out.println("Small");
else if (size == 0)
System.out.println("Medium");
else
System.out.printIn("Large");What will be the output of the following code?
int fruit = 3;
switch (fruit + 1)
{
case 1:
System.out.println("Banana");
break ;
case 2:
System.out.println("Apple");
break ;
case 3:
System.out.println("Orange");
break ;
default :
System.out.println("Fruitless");
}Predict the output of the following code snippet:
int a = 1;
int b = 2;
if (a == b)
System.out.println ("Both values are equal");
else
System.out.println ("Values are not equal");Consider the following code snippet:
if ( c > d)
x = c;
else
x = d;Choose the correct option if the code mentioned above is rewritten using the ternary operator:
if ((a > b) && (a > c)), then which of the following statements is true?
Consider the following code snippet:
int val = 2;
switch (val)
{
case 1: System.out.println("Case 1");
break;
case 2: System.out.println("Case 2");
break;
default: System.out.println("No match found");
break;
}Which of the following statements is correct?
A sequence of statements enclosed between a pair of curly brackets is called
Which clause is optional in the switch statement?
Which of the following statements involves a fall-through?
Which of the following causes a fall-through in the switch statement?
Which of the following is mandatory in the switch statement?
Which of the following statement is a valid combination?