use stack address as loop ounter

loop.cpp

#include <stdio.h>

void execute(int n, int total) {
  printf("loop count : %d/%d\n", n, total);
}


int loop_core(int *root_addr, int *prev_addr, int num) {
  int base_value = 0;

  // comment or uncomment
  printf("%d\n", base_value);

  if(root_addr == prev_addr) {
    // entry point
    execute(0, num);
    return loop_core(root_addr, &base_value, num);

  } else {
    // normal
    const int loop_index = ((unsigned long)root_addr - (unsigned long)&base_value) / ((unsigned long)prev_addr - (unsigned long)&base_value);

    if(loop_index < num) {
      execute(loop_index, num);
      return loop_core(root_addr, &base_value, num);

    } else {
      return 0;
    }
  }
}

int loop(int num) {
  int base_value = 0;
  return loop_core(&base_value, &base_value, num);
}


int main() {
  loop(5);
  return 0;
}