/C/Come fare un programma in c con cui interagire

Come fare un programma in c con cui interagire

#include <stdio.h>
#define euro(e) lira / 1936,27
#define lira(l) 1936.27 * euro
int main()
{
  double lira, euro, x;
  lira = 5000;
  euro
  printf("la conversione è:\n");
  printf("%f\n", x);    
return 0;
}

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