#define and #ifdef : if def « Macro Preprocessor « C / ANSI-C

1. C / ANSI-C
2. Macro Preprocessor
3. if def

#define and #ifdef

//file1.h
#define USD 1

//file2.h
#define UKP 1

//file3
#include <stdio.h>
#include <file1.h>

#if !defined (USD) || !defined (UKP)    
    #error "RROR: NO_CURRENCY rate is specified."
#endif

main() {    
    
  int rs;
  rs = 10 * currency_rate;
  printf ("d\n", rs);
}


           
       

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