C Program to Display the IP Address of the System

#include< stdio.h>
#include< string.h>
#include< sys/types.h>
#include< sys/socket.h>
#include< sys/ioctl.h>
#include< netinet/in.h>
#include< net/if.h>
#include< unistd.h>
#include< arpa/inet.h>
 
int main()
{
    int n;
    struct ifreq ifr;
    char array[] = "eth0";
 
    n = socket(AF_INET, SOCK_DGRAM, 0);
    //Type of address to retrieve - IPv4 IP address
    ifr.ifr_addr.sa_family = AF_INET;
    //Copy the interface name in the ifreq structure
    strncpy(ifr.ifr_name , array , IFNAMSIZ - 1);
    ioctl(n, SIOCGIFADDR, &ifr);
    close(n);
    //display result
    printf("IP Address is %s - %s\n" , array , inet_ntoa(( (struct sockaddr_in *)&ifr.ifr_addr )->sin_addr) );
    return 0;
}

Output

 IP Address is eth0 - 192.168.225.135

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