1. Computer Programming
Lab(5)

2. Exercise 1
(Convert feet into meters) Write a program that reads a number in feet, converts it to meters, and displays the result. One foot is meter. Here is a sample run:

3. Source code: package ex2_3; import java.util.Scanner;
public class EX2_3 {
public static void main(String[] args) {
Scanner input = new Scanner (System.in);
System.out.println("Enter a value in feet : ");
double feet = input.nextDouble();
double meter = feet *0.305 ;
System.out.println(feet+ " Feet is " + meter + " meter."); }

4. Output:

5. Exercise 2
(Financial application: calculate tips) Write a program that reads the subtotal and the gratuity rate, then computes the gratuity and total. For example, if the user enters 10 for the subtotal and 15% for gratuity rate, the program displays $1.5 as gratuity and $11.5 as total. Here is a sample run :

6. Source code: package ex2_5; import java.util.Scanner;
public class EX2_5 {
public static void main(String[] args) {
// Read subtotal
Scanner input = new java.util.Scanner(System.in);
System.out.print("Enter subtotal and gratuity rate: ");
double subtotal = input.nextDouble();
double rate = input.nextDouble();
double gratuity = subtotal * rate / 100;
double total = subtotal + gratuity;
System.out.println ("The gratuity is " + gratuity +
" total is " + total); }

7. Output:

8. Exercise 3
(Swap two numbers) Write a program that swap two integers then displays them before and after swapping.

9. Output:

10. Source code: public class EX1 {
public static void main(String[] args) {
int num1 = 10;
int num2 = 20;
System.out.println("Before Swapping");
System.out.println("Value of num1 is :" + num1);
System.out.println("Value of num2 is :" +num2);
//swap the value
int temp = num1;
num1 = num2;
num2 = temp;
System.out.println("After Swapping"); }