Dumb Loop

/*
 *  int i=16 , j=4;
 *  for(i--;i--;i--)
 *  i=i/2 ; j=i+1;
 *  printf("%d",i+j);
 *
 *  How this loop work
 */

#include <stdio.h>

#define SHOWWORK

int main() {
  int i = 13 , j = 4;
#ifdef JUSTDUMB
  for (i--; i--; i--)
    printf("i: %d\n", (i = i / 2)) ; printf("j: %d\n", (j = i + 1));
#else
# ifdef SHOWWORK
  printf("i| %d\n", i);
  printf("j| %d\n", j);
  size_t kk = 0;
  for (i--; i-- > = 0; i--) {
    if (kk++ == 12) {
      printf("GRONK! %d\n", i);
      break;
    }
    int ik = i;
    // i = i / 2;
    printf("i: %d, %d\n", ik, (i = i / 2));
  }
  int jk = j;
  printf("i> %d\n", i);
  // j = i + 1;
  printf("j> %d, %d\n", jk, (j = i + 1));
# else
  size_t kk = 0;
  for (i--; i--; i--) {
    if (kk++ == 12) {
      printf("GRONK! %d\n", i);
      break;
    }
    i = i / 2;
  }
  j = i + 1;
# endif
#endif
  printf("!: %d %d\n", i, j);
  printf("!: %d\n", i + j);
  // How this loop work

  return 0;
}

#ifdef JUSTASDUMB
  int i = 13 , j = 4; for (i--; i--; i--) i = i / 2 ; j = i + 1; printf("%d\n", i + j);

#endif