Q1 Design and then implement a program that reads a series o

Q1: Design and then implement a program that reads a series of 5 doubles from the user and prints their average. Read each input value as a string, and then attempt to convert it to a double using the Double.parseDouble method. This method will throw an exception if the parameter given to it cannot be parsed. If this exception occurs (meaning that the input is not a valid number), print an appropriate error message and prompt for the number again. Continue reading values until 5 valid doubles have been entered.

Sample Output:

Solution

AverageTest.java

import java.util.Scanner;

public class AverageTest {

  
   public static void main(String[] args) {
       Scanner scan = new Scanner(System.in);
       double d[]= new double[5];
       for(int i=0; i<d.length; i++){
           System.out.print(\"Please enter a number: \");
           String s = scan.next();
           try{
               d[i] = Double.parseDouble(s);
           }catch(NumberFormatException e){
               System.out.println(\"Please enter a valid number.\");
               i--;
           }
       }
       double sum = 0;
       for(int i=0; i<d.length; i++){
           sum = sum + d[i];
       }
       double average = sum/d.length;
       System.out.println(\"The average is : \"+average);
   }

}

Output:

Please enter a number: 5
Please enter a number: 5.5
Please enter a number: number
Please enter a valid number.
Please enter a number: \'1
Please enter a valid number.
Please enter a number: 2
Please enter a number: 3.445667
Please enter a number: 1
The average is : 3.3891334