#define _CRT_SECURE_NO_WARNINGS
#include<stdlib.h>
#include<stdio.h>
int main(void)
{
    printf("first
");
    printf("second
");
    printf("third
");
    printf("fourth

");
    printf("fifth
");
    printf("sixth

");
    printf("seventh

");

    system("pause");
    return 0;
}

今天才意思到有一个 /r

哈哈哈