In this program we will find the average of two numbers. To find average of two numbers, they are added and their sum is divided by two.

Problem:
Input two numbers from the user and display their average on the screen.

Code:
 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
 /**
  * @author Hafiz Muhammad Umer
  */
 import java.util.Scanner;
 public class Average 
 {
     public static void main(String[] args) 
     {
         Scanner input=new Scanner(System.in);
         double a,b,avg;
         System.out.print("Enter first number: ");
         a=input.nextDouble();
         System.out.print("Enter second number: ");
         b=input.nextDouble();
         avg=(a+b)/2;
         System.out.println("The average of "+a+" and "+b+" is "+avg);
     }
 }
Output:
Enter first number: 1
Enter second number: 2
The average of 1.0 and 2.0 is 1.5
Explanation:
  • The line 4 imports the Scanner utility in java. It will be used to create Scanner objects so that we can take input in our program.
  • Line 5 defines a class which ends at line 18.
  • Line 7 defines the main method which ends at line 17.
  • Line 9 creates a Scanner object named input.
  • Line 10 defines three double variables.
  • From line 11 to 14, two values are taken from the user as input.
  • At line 15, the average of a and b is calculated and stored in the variable avg.
  • At line 16, the average is displayed on the screen.