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How to redefine a Macro in C?

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mahmoud2506
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2022-05-04
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How to redefine a Macro in C?

The process to redefine a Macro is:

  1. Macro must be defined.
  2. When, you want to redefine the Macro, first of all, undefined the Macro by using #undef preprocessor directive.
  3. And, then define the Macro again by using #define preprocessor directive.
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mahmoud2506
2022-05-04
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Example:

#include <stdio.h>

#define NUM 100

int main()
{
	//printing the value of NUM
	printf("NUM: %d\n", NUM);
		
	//redefining the Macor: NUM 
	#undef NUM
	#define NUM 200
	
	//printing the value of NUM 
	printf("NUM: %d\n", NUM);
	
	return 0;
}

Output

    NUM: 100
    NUM: 200

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