Define macro inside the main function

  
#include <stdio.h>

void f(void);

int main(void)
{
  #define LIGHTSPEED 186000

  f();

  return 0;
}

void f(void)
{
  printf("%ld", LIGHTSPEED);
}

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Define macro inside the main function : Macro Constant « Macro Preprocessor « C / ANSI-C

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