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

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C / ANSI-C » Macro Preprocessor » if def

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#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);

}

Related examples in the same category

1.	Simple #if example
2.	Simple #if/#else example
3.	#define, #ifdef #else example

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