Answer:
The program to this question can be given as:
Program:
import java.util.*; //import package for user input.
public class Main //define class-main
{
public static void main (String ar []) //define main function
{
try //try block
{
int a,b,c,sum=0; //declare variable
double average;
Scanner ob= new Scanner(System.in); //create Scanner class Object
System.out.print("Enter first number :"); //message.
a = ob.nextInt(); //input number.
System.out.print("Enter second number :");
b = ob.nextInt();
System.out.print("Enter third number :");
c = ob.nextInt();
//print numbers
System.out.print("\nFirst number:"+a);
System.out.print("\nSecondnumber:"+b);
System.out.print("\nThird number:"+c);
sum =sum+a+b+c; //Sum
average = sum/3; //Average
System.out.print("\nAverage:" + average); //print average
}
catch (Exception e) //catch block.
{
System.out.print("Enter number only..!"); //message
}
}
}
Output:
Enter first number 5
Enter second number 2
Enter third number 17
First number: 5
Second number: 2
Third number: 17
Average: 8.0
Explanation:
In the above program firstly we import packages for user input. Then we declare the main class. In the main class, we define the main function in the main function we use the exception handling. In the exception handling, we use try and catch block. In the try block firstly we declare variables then create a scanner class object and take input from the user. After user input we add all numbers into the sum variable then we take average in the average variable and print all values. If the user doesn't input a number then we use the catch block in this block it prints a simple message that is "Enter number only..!"
