为什么在C中使用错误的格式说明符会使我的程序在Windows 7上崩溃？

My program is as follows;

我的节目如下;

#include <stdio.h>
#include <string.h>

int main()
{
        char string[] = "Gentlemen start your engines!";
        printf("That string is %s characters long.\r\n", strlen(string));
        return 0;
}
#include