typedef struct
{
int x, y;
} P;
 
P getPoint()
{
int a, b;
//a = .... b = .....
P temp;
temp.x = a;
temp.y = b;
return temp;
}

SomeTypeA Function( <arguments>,   SomeTypeB *x)
{
       *x = whatever_data_needed_other_than_return_value();
       return return_value();
}

char arithmeticOperation(int a, int b, int c)
{
	// +
	if(a + b == c) return '+';
 
	// -
	if(a - b == c) return '-';
 
	//you also do this if the order you pass the numbers isn't critical
	if(b - a == c) return '-';
 
	// *
	if(a * b == c) return '*';
 
	// /
	if(a / b == c) return '/';
	if(b / a == c) return '/';
 
	// %
	if(a % b == c) return '%';
	if(b % a == c) return '%';
 
	//if nothing matches
	return ' '; // return a space
}
 
int main(void)
{
	char c = arithmeticOperation(4, 2, 0);
 
	if(c == ' ') // check if it's a space which means there isn't an operation
		printf("No arithmetic operation found.\n");
	else
		printf(%c, "Operation ", c, " found.\n");
}