Computer Programming

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 0.305 meter. Here is a sample run:

3. Source code: package ex2_3; importjava.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; importjava.util.Scanner; public class EX2_5 { public static void main(String[] args) { // Read subtotal Scanner input = newjava.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"); System.out.println("Value of num1 is :" + num1); System.out.println("Value of num2 is :" +num2); } }