Error: Void value not ignored as it ought to be in C programming

Question

I am writing a C program which has two functions. One function is the usual main function and the other is a pointer void function. When I try to compile my program in a Linux

Answer 1

This:

void function_1(int *num1, int *num2)

returns nothing. void is kind of a "nothing" type, in an expression, it means to ignore the result, as a return type, it means nothing is returned. Assigning the (non-existent) return value of a void function doesn't make sense.

Answer 2

As mentioned in your previous question, a void function returns nothing, so you can't assign its return value to anything. That's why you're getting the error.

If you want the function to send back a value but have a void return type, define it like this:

void function_1(int num1, int num2, int *total) 
{
    *total = num1 / num2;
}

And call it like this:

function_1(numerator, denominator, &finalAnswer);

Also, your final printf should be this:

printf("%d / %d = %d \n", numerator,denominator,finalAnswer);