Defining a macro to compare two values


/*
The macro function can work with numerical values
of any type. The values can be variables, constants or expressions.
*/
#include <stdio.h>

#define COMPARE(x,y)   ((x)<(y)?-1:((x)==(y)?0:1))

int main()
{
  double a = 1.5;
  int n = 2;
  float z = 1.1f;
  printf("\n compare %lf (double) with %f (float): %d", a , z, COMPARE(a,z));
  printf("\n compare %lf (double) with %d (int): %d", a , n, COMPARE(a,n));
  printf("\n compare %d (int) with %f (float): %d", n , z, COMPARE(n,z));
  printf("\n compare \" n * a\" = %lf \n"
    " with \"n+1\" = to %d (double): %d",
     n*a , n+1, COMPARE(n*a,n+1));
  printf("\n");
}

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Defining a macro to compare two values : Macro Function « Macro Preprocessor « C / ANSI-C

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