Preprocessor-LOOPS

#include <stdio.h>

#define LOOP 1

int main(){
    #ifdef LOOP
        #if LOOP == 1
           for (int i = 0; i < 10; i++){
              printf("Hello\n");
           }
        #elif LOOP == 2
           int i = 0;
           while (i < 10){
              printf("Hello\n");
              i++;
           }
        #elif LOOP == 3
           int i = 0;
           do{
             printf("Hello\n");
             i++;
           } while (i < 10);
        #endif
    #else
        printf("LOOP is not defined!\n");
    #endif
   return 0;
}