Given three assignment marks, each of which is marked out of 20. Write a java program to calculate and print the average mark out of 100.

Question

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Java

package Grade;
import java.util.*;

public class Grade {

   
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
          
        System.out.println("Enter the first number: ");
  int M1 = input.nextInt();

        System.out.println("Enter the second number :");
           int M2 = input.nextInt();
               
  System.out.println("Enter the third number: ");
           int M3 = input.nextInt();
             
           int total = M1+M2+M3;
           
             System.out.println("Average of three numbers is: " + 
                       total / 60)*100) ;

What I have tried:

Enter the first number:
15
Enter the second number :
20
Enter the third number:
10
Average of three numbers is: 0
BUILD SUCCESSFUL (total time: 19 seconds)

Posted 13-Sep-22 9:25am

Member 15766438

Updated 13-Sep-22 20:12pm

Dave Kreskowiak

v2

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CPallini · Accepted Answer · 2022-09-13T20:12:00

You are using the correct computation with a wrong datatypes. The result must be a double and you have to force the use of floating point division in the expression (in your expression, the integer division is used). Replace

Quote:
System.out.println("Average of three numbers is: " +
total / 60)*100) ;

with

Java

double result = total*100.0/60; // same of 'result = total*5.0/3;'

 System.out.println("Average of three numbers is: " +
             result) ;

Dave Kreskowiak · Accepted Answer · 2022-09-13T09:55:00

Solution 1

Your lack of a question or problem description leaves one to assume you're trying to calculate an average and not coming up with the correct answer.

You've got this in your code:

Java

int total = M1+M2+M3;
           
             System.out.println("Average of three numbers is: " + 
                       total / 60)*100) ;

So how do you calculate an average? You add up the values you have, in your case 15, 20, and 10, then divide that total by the number of values you added together, 3.

Where did you get the "divided by 60, times 100" garbage from?

Posted 13-Sep-22 9:55am

Dave Kreskowiak

Comments

CPallini 14-Sep-22 2:15am

The OP terminology is not exact. But the computation is logically correct (technically flawed), if you consider the requirements.

Dave Kreskowiak 14-Sep-22 8:04am

Wow. That's what 3 hours of sleep gets me. I should have gone back to read the description for the eleventh time, and maybe I would have gotten it.
:doh:

Member 15766438 14-Sep-22 16:42pm

thank you