1.思维导图

2.指针形式验证大小端存储

#include<myhead.h>int main(int argc, const char *argv[])
{int num = 0x12345678;char* ptr = (char *)&num;if(*ptr == 0x12){printf("big endian\n");}else if(*ptr == 0x78){printf("little endian\n");}return 0;
}

3.共用体形式验证大小端存储

#include<myhead.h>int main(int argc, const char *argv[])
{union Endian{int num;char ch;}data;data.num = 0x12345678;if(data.ch = 0x12){printf("big endian\n");}else if(data.ch == 0x78){printf("little endian\n");}return 0;
}

4.主机字节序与网络字节序转换

#include<myhead.h>int main(int argc, const char *argv[])
{unsigned int num = 0x12345678;unsigned short value = 0x1234;unsigned int num1 = htonl(num);unsigned short value1 = htons(value);printf("num1 = %#x\n",num1);printf("value1 = %#x\n",value1);return 0;
}

5.点分十进制

#include<myhead.h>int main(int argc, const char *argv[])
{char *ip = "192.126.125.194";in_addr_t ip_test = inet_addr(ip);printf("ip_test = %#x\n",ip_test);printf("对应的主机字节序为：%#x\n",ntohl(ip_test));return 0;
}

6.手动实现将小端存储的数据转换成大端存储

#include<myhead.h>int main(int argc, const char *argv[])
{int num = 0x12345678;char *ptr = (char*)&num;if(*ptr == 0x12){printf("big endian\n");}else if(*ptr == 0x78){printf("little endian\n");}char *qtr = ptr+3;while(qtr > ptr){char temp = *ptr;*ptr = *qtr;*qtr = temp;ptr++;qtr--;}printf("num = %#x\n",num);return 0;
}