My question is bit large.. So, kindly read the description 🙂

Question

While declaring a function we write the return type before the function, then why don't we write the return type before calling the function??

void show(); ----- function declaration

int main() {
...............
show(); ----- calling the function
}

void show() {
........... ------ definition
}

Answer 1

Actually we do, except as per your snippet, we don't because the function returns nothing (void).

For example:
int add( int a, int b )
{
// function body
}

Somewhere in the code ...

int result = add( 19, 36 );

You see an `int` variable is prepared there to capture return value from add() function

Answer 2

Ipang Aha.. I see.. Thanks Ipang 🙂