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iOS

Posted by Justine Lam
Justine Lam
8,785 Points

What does void mean in C?

Was doing a google search but couldn't find a good explanation. It seems like it's for declaring a function.

1 Answer

Stone Preston
Stone Preston
42,016 Points

Void is used as the return type when declaring a function that doesnt return anything.

If I wrote a function that returned an int I would use int as the return type:

int someFunction(int a, int b) {

int sum = a + b;
return sum;

}

if I wrote a function that doesnt return anything, I would need to use void as the return type

void someFunction(int a, int b) {

//im not returning anything here, just printing it out on screen
int sum = a + b;
printf("%d", sum);
//since nothing is being returned in the function, the return type should be void

}

A lot of the time, the functions you write wont return anything, they just do something.

John Wheal
John Wheal
27,969 Points

Don't forgot that you can also use it for functions that don't take any variables. For example:

int myFunction(void);