c/c++实现获取域名的IP地址

Sure! Here is a step-by-step guide on how to implement obtaining the IP address of a domain in C/C++:

1. Include the necessary header files:

#include <stdio.h>
#include <stdlib.h>
#include <netdb.h>
#include <arpa/inet.h>

1. Declare the main function:

int main() {
    // Code goes here
    return 0;
}

1. Prompt the user to enter a domain name:

char domain[100];
printf(\"Enter a domain name: \");
scanf(\"%s\", domain);

1. Use the gethostbyname function to retrieve the IP address:

struct hostent *host;
host = gethostbyname(domain);

1. Check if the domain exists:

if (host == NULL) {
    printf(\"Domain not found.\
\");
    return 1;
}

1. Convert the IP address to a string format:

char ip[100];
inet_ntop(AF_INET, host->h_addr_list[0], ip, sizeof(ip));

1. Print the IP address:

printf(\"IP address: %s\
\", ip);

1. Complete the main function:

int main() {
    char domain[100];
    printf(\"Enter a domain name: \");
    scanf(\"%s\", domain);

    struct hostent *host;
    host = gethostbyname(domain);

    if (host == NULL) {
        printf(\"Domain not found.\
\");
        return 1;
    }

    char ip[100];
    inet_ntop(AF_INET, host->h_addr_list[0], ip, sizeof(ip));

    printf(\"IP address: %s\
\", ip);

    return 0;
}

Now, let's see two examples of how to use this code:

Example 1:

Enter a domain name: www.google.com
IP address: 172.217.168.196

Example 2:

Enter a domain name: www.openai.com
IP address: 104.16.249.35

Please note that this code only supports IPv4 addresses. If you want to support IPv6 addresses, you will need to modify the code accordingly.