#include <stdio.h>
#include <stdlib.h>

int main() {
   int A = 5, B = 7, count_one, count_two;

   // %nフォーマット文字列の例(文字'X'までに出力したバイト数が、
   // それぞれcount_oneとcount_twoに格納される)
   printf("The number of bytes written up to this point X%n is being stored is count_one, and the number of bytes up to here X %n is being stored in count_two.\n", &count_one, &count_two);

   printf("count_one: %d\n", count_one);
   printf("count_two: %d\n", count_two);

   // スタックの例
   printf("A is %d and is at %08x. B is %x.\n", A, &A, B);

   exit(0);
}