Debugging using pre-processing directives : Debug « Development « C / ANSI-C

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3. Debug

Debugging using pre-processing directives

#include <stdio.h>
#include <stdlib.h>

#define test
#define testf

int sum(int, int);
int product(int, int);
int difference(int, int);

int main()
{
  int i = 0;
  int j = 0;
  int a = 10, b = 5;
  int result = 0;
  int (*pfun[3])(int, int);


  pfun[0] = sum;
  pfun[1] = product;
  pfun[2] = difference;

  for(i = 0 ; i < 3 ; i++)
  {
    j = i;
    #ifdef test
    printf("\nRandom number = %d", j );
    #endif

    result = pfun[j](a , b);
    printf("\nresult = %d", result );
  }
  result = pfun[1](pfun[0](a , b), pfun[2](a , b));
  printf("\n\nThe product of the sum and the difference = %d\n", result);
}

int sum(int x, int y){
  #ifdef testf
  printf("\nFunction sum called.");
  #endif

  return x + y;
}
int product( int x, int y ){
  #ifdef testf
  printf("\nFunction product called.");
  #endif

  return x * y;
}
int difference(int x, int y){
  #ifdef testf
  printf("\nFunction difference called.");
  #endif
  return x - y;
}


           
       

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