点分十进制转换

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
/*
int inet_aton(const char *cp, struct in_addr *inp);
in_addr_t inet_addr(const char *cp);
in_addr_t inet_network(const char *cp);
char *inet_ntoa(struct in_addr in);
struct in_addr inet_makeaddr(int net, int host);
in_addr_t inet_lnaof(struct in_addr in);
in_addr_t inet_netof(struct in_addr in);
*/
// cp 点分十进制字符串 如 198.0.0.1
/*
struct in_addr {
                      unsigned long int s_addr;
}
*/
#include<stdio.h>
#include<string.h>
int main()
{
    const char *cp = "192.168.0.10";
    struct in_addr in_addr_tmp;
    //1. inet_aton
    memset(&in_addr_tmp,0,sizeof in_addr_tmp);
    if(inet_aton(cp,&in_addr_tmp) == 0)
    {
        printf("error\n");
        exit(0);
    }
    printf("%ld\n",in_addr_tmp.s_addr);

    //2. inet_addr
    in_addr_t in_addr_t_1 = inet_addr(cp);
    printf("%ld\n",in_addr_t_1);
    printf("%ld\n",htonl(in_addr_t_1));
 
    //3. inet_network
    printf("cp=%s\n",cp);
    in_addr_t in_addr_t_2 = inet_network(cp);
    printf("%ld\n",in_addr_t_2);
    printf("%ld\n",ntohl(in_addr_t_2));
 
    //4. inet_ntoa
    printf("%s\n",inet_ntoa(in_addr_tmp));
 
    //5.net_makeaddr 主机位和网络位合并成一个ip
    int net = 0x00001276;
    int host= 0x0000ABEF;
    struct in_addr in_addr_tmp_t = inet_makeaddr(net,host);
    printf("%x\n",in_addr_tmp_t.s_addr);
 
    //6. inet_lnaof取主机位 inet_netof取网络位
    printf("%x\n",inet_lnaof(in_addr_tmp_t));
    printf("%x\n",inet_netof(in_addr_tmp_t));
    return 0;
}