This is Java class Write a program that calculates the average of N integers. Th

Question

This is Java class

Write a program that calculates the average of N integers. The program should prompt the user to enter the value for N and then afterward must enter all N numbers. Use an array to save the N integers. If the user enters a nonpositive value for N, then an exception should be thrown (and caught) with the message “N must be positive.” If there is any exception as the user is entering the N numbers, an error message should be displayed, and the user prompted to enter the number again.

Explanation / Answer

AverageCalc.java

import java.util.InputMismatchException;
import java.util.Scanner;

public class AverageCalc {

  
   public static void main(String[] args) {
       Scanner scan = new Scanner(System.in);
       System.out.print("Enter the N value: ");
       int n = scan.nextInt();
       if(n > 0){
       int a[] = new int[n];
       for(int i=0; i<a.length; i++){
           try{
           System.out.println("Enter a positive number #"+(i+1)+": ");
           a[i] = scan.nextInt();
          
           }catch(InputMismatchException e){
               i--;
               System.out.print("Invalid number. ");
               scan.nextLine();
           }
       }
       int sum = 0;
       for(int i=0; i<a.length; i++){
           sum = sum + a[i];
       }
       double average = sum/(double)n;
       System.out.println("Average is "+average);
       }
       else{
           System.out.println("N must be positive");
       }
   }

}

Output:

Enter the N value: 5
Enter a positive number #1:
4
Enter a positive number #2:
3
Enter a positive number #3:
2
Enter a positive number #4:
o
Invalid number. Enter a positive number #4:
t
Invalid number. Enter a positive number #4:
8
Enter a positive number #5:
9
Average is 5.2

Enter the N value: -5
N must be positive

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