1. 冒泡排序法

2. strlen、strcpy、strcat、strcmp的用法和原理

3. 大小端的区分

3.1 主函数区分大小端

#include <stdio.h>int main(void)
{int num = 0x11223344;char *p = (char *)&num;if (0x11 == *p){printf("大端!\n");}else if (0x44 == *p){printf("小端!\n");}return 0;
}

3.2 共用体区分大小端

#include <stdio.h>union u 
{char a;int b;
};int main(void)
{union u u1;u1.b = 1;if (u1.a){printf("小端!\n");}else {printf("大端!\n");}return 0;
}