//16进制1个和2字符为1个字节,3个支付为2个字节    int a = 0x12345678;    char *p = &a;    printf("%x\n",*p);        p++;//从78移动到56    printf("%x\n", *p);        p++;//从56移动到34    printf("%x\n",*p);

void ip2string(int n){    unsigned char *p;        p = &n;        printf("%u.%u.%u.%u\n",*p,*(p+1),*(p+2),*(p+3));}void string2ip(char s[]){    int a = 0;    int b = 0;    int c = 0;    int d = 0;    sscanf(s,"%d.%d.%d.%d",&a,&b,&c,&d);    //printf("a=%d,b=%d,c=%d,d=%d\n",a,b,c,d);    int ip;    char *p;    p = &ip;    *p = a;    p++;    *p = b;    p++;    *p = c;    p++;    *p = d;    printf("%d",ip);}int main(){    //ip地址的保存方法,通过一个int传递IPV4的地址,可以保证4个字节足够了    //"192.168.1.2" //11个字节    //"234.213.222.231" //15个字节    //"1.1.1.1" //7个字节    //IP在网络中传递的时候是一个DWORD,就是一个int    //"192.168.6.252"    int ip = 0;    unsigned char *p1;    p1 = &ip;    *p1 = 192;    p1++;    *p1 = 168;    p1++;    *p1 = 6;    p1++;    *p1 = 252;    printf("%d\n",ip);    ip2string(ip);    char s[100] = "192.168.6.252";    string2ip(s);    return 0;}