#ifndef Demo : ifndef « Macro Preprocessor « C / ANSI-C

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2.	Console
3.	ctype.h
4.	Data Structure Algorithm
5.	Data Type
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10.	Macro Preprocessor
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17.	Small Application
18.	stdio.h
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23.	time.h
24.	wctype.h

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C / ANSI-C » Macro Preprocessor » ifndef

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#ifndef Demo



      

//file1.h

#define USD 1



//file2.h

#define UKP 1



//file3

#include <stdio.h>

#include <file1.h> 



#ifndef USD  

       #define currency_rate 100 

#endif 



#ifndef UKP 

   #define currency_rate 46 

#endif 



main()

{    

  int rs;

  rs = 10 * currency_rate; 

  printf ("%d\n", rs);

}

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