using a void method with two int parameters instead of an int?

Question

I have no problem using a method int to run this program; however I wanted to be able to learn how to do the void method.

I know the return statement isn't necessary in void, and for void with two int parameters. In my book it said parameters should be written as (int a, int b).

However, in my code for lines 16 and 17

sum = computeSum(num1, num2);
product = computeProduct(num1, num2);)

I get the error incompatible types, void cannot be converted to int.

How do I rectify this for future reference? Thanks so much!

 import java.util.Scanner;

 public class Lab6
 {
     public static void main (String [] args)
     {      
         //create a scanner object for receiving user input
         Scanner keyboard = new Scanner (System.in);
         int num1, num2, sum, product;

         System.out.println ("Please enter an integer: ");
         num1 = keyboard.nextInt();
         System.out.println ("Please enter another integer: ");
         num2 = keyboard.nextInt(); 

         sum = computeSum(num1, num2);
         product = computeProduct(num1, num2);
     }

     public static void computeSum(int num1, int num2)
     {
         int sum = 0;
         sum = num1 + num2; 

         System.out.println ("The sum of your integers is " + sum);
     }

     public static void computeProduct(int num1, int num2)
     {
         int product = 0; 
         product = num1 * num2;

         System.out.println("\nThe product of your integers is: " + product);
     }
 }

void means method does not return a value, so how will u get the product? The only way is that you set a variable which is visible in both calling method and called method. — Juned Ahsan
– Juned Ahsan, Commented Oct 16, 2014 at 5:03

Eng.Fouad · Accepted Answer · 2014-10-16 05:03:41Z

2

The method computeSum()'s return type is void, i.e. it returns nothing which means it cannot be assigned to a variable. Hence, the following is not possible:

sum = computeSum(num1, num2);

answered Oct 16, 2014 at 5:03

Eng.Fouad

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Comments

MadProgrammer · Accepted Answer · 2014-10-16 05:03:53Z

1

As you said, void methods don't return a value, so sum = computeSum(num1, num2); makes no sense, as computeSum doesn't return anything.

You should try using...

computeSum(num1, num2);
computeProduct(num1, num2);

instead...

answered Oct 16, 2014 at 5:03

MadProgrammer

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1 Comment

mrkrebs Over a year ago

Thank you! I figured it out, I copied the program over and forgot to take that out. Thanks!

NevilleDNZ · Accepted Answer · 2014-11-07 02:16:26Z

1

Steve Bourne proposed that Algol68's VOID be defined as MODE VOID = STRUCT(). When Steve arrived at Bell Labs he talked Dennis into adding void as a type in C. It saved the instruction loading register for return value. Also when Steve got to the lab C types were like PL/1 namely offsets from any base you liked. They changed to A68 types but be the specific reason for this change is now lost. A few other A68isms ended up in C. Speculation: Std C could have considered typedef struct{}void ...

answered Nov 7, 2014 at 2:16

NevilleDNZ

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