I'm trying to make a macro with the following formula: (a^2/(a+b))*b, and I want to make sure that the there will be no dividing by zero. 

#define SUM_A( x, y ) if( x == 0 || y == 0) { 0 } else { ( ( ( x * x ) / ( ( x ) + ( y ) ) ) * ( y ) )}

and then I call the macro inside main:

float a = 40, b = 10, result; 
result = SUM_A(a, b); 
printf("%f", result);

I've tried using brackets around the if function but I keep getting syntax errors before the if statement. I've also tried using return, but I read somewhere that you're not supposed to use that in define.

c if-statement macros c-preprocessor
Edit
Report