電腦在偷懶?

兩次的輸出不一樣??? 是不是電腦在偷懶?


this
is
a
string
this


#include <stdio.h>
#include <string.h>
int main(void)
{
  char string[] = "this is a string";
  char *start;

  start = string;
  start = strtok(start, " ");
  while (start != NULL) {
    printf("%s\n", start);
    start = strtok(NULL, " ");
  }
  start = string;
  start = strtok(start, " ");
  while (start != NULL) {
    printf("%s\n", start);
    start = strtok(NULL, " ");
  }
  return 0;
}