Thread: simple macro not working???

Can anybody tell me why this won't compile. I am trying to understand who macro's work and this seems about as simple as it gets.

Code:

 #include <iostream>
 
using std::cout;
using std::cin;
using std::endl;

#define MINIMUM2 (x,y)    if (x < y)            \          
                            lowestNumber = x;   \
                          else                  \
                            lowestNumber = y;
                        
#define NUM1 = 5
#define NUM2 = 10


//***************************************************
//MAIN FUNCTION
int main()
{
   
   double lowestNumber = 0;
               
   MINIMUM2(NUM1, NUM2);

   cout << "Lowest number = " << lowestNumber;
  
   return 0;
}

I removed that space and also remove the "=" signs form the sysbolic constant for NUM1 and NUM2.

The error are getting fewer but there is still something wrong with the macro defination. Here is one of the errors I am still getting:

error C2501: 'lowestNumber' : missing storage-class or type specifiers

Any ideas??

Thanks, That worked, but I don't understand it.

What didn't the compiler like about the way I had it?

What does ?x:y do in the macro?

Thanks,

What does ?x:y do in the macro?

its true or false, "?"means true. ":" means false

So the code checks to see if x < y. If that is true then x is returned if it is false then y is returned.

Is that correct?

Thanks!!