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I may have gotten the entire concept of
preprocessor directives wrong (after all
I've done more C++ than C), but shouldn't
the
printf ("The answer is %d\n", MULTIPLY);
have parameters too?
#include <stdio.h>
#define MULTIPLY (ADD * z)
#define ADD (x + y)
#define x 1
#define y 2
#define z 3
int main()
{
printf("%d\n", MULTIPLY);
return 0;
}
Since MULTIPLY and ADD are supposed to be constant, they shouldn't be #defined as taking inputs. The following is probably an introduction to the sorts of things you want to do with macros taking parameters:
Code:
#include <stdio.h>
#define MULTIPLY(a, b) ((a) * (b))
#define ADD(a, b) ((a) + (b))
#define WRAPPER(a, b, c) (MULTIPLY(ADD(a, b), c))
#define WRAPPER2 WRAPPER(x, y, z)
#define x 1
#define y 2
#define z 3
int main()
{
printf("%d\n", WRAPPER2);
return 0;
}
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