#include <stdio.h>


#define debugPrintf(...)           \
  if( debugMode == 1 ) {           \
    printf(__VA_ARGS__);           \
  }                                            


int debugMode = 1;

int fact(int n) {
  if( 0 == n || 1 == n ) {
    return 1;
  }
  return n * fact(n-1);
}

int main(int argc, char **argv) {
  int i=0;
  for(i=0; i < 5; i++) {
    debugPrintf("The factorial of %d is %d\n", i, fact(i));
    debugPrintf("This is the line numbe %d\n", i+1);
    debugMode = 0;
    debugPrintf("This is the second line numbe %d\n", i+1);
    debugMode = 1;
    debugPrintf("This is after turning on again the line numbe %d\n", i+1);
  }
}