C - Convert quad-dotted-decimal notation into binary data in network byte order and vice versa
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Public domain
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### -- 1 --

    #include <arpa/inet.h>
    #include <stdio.h>
    #include <stdlib.h>
    int main()
    {
            struct in_addr addr;
            char ip[]="192.168.29.57";
     
            if (inet_aton(ip, &addr) == NULL) {
                    perror("inet_aton");
                    exit(EXIT_FAILURE);
            }
            printf("%lu\n", addr.s_addr);
            exit(EXIT_SUCCESS);
    }
    
********************************************************************************
### -- 2 --

    #include <arpa/inet.h>
    #include <stdio.h>
    #include <stdlib.h>
    int main()
    {
            struct in_addr addr;
            char *ip;
     
            addr.s_addr=958245056;
            if ((ip=inet_ntoa(addr)) == NULL) {
                    perror("inet_ntoa");
                    exit(EXIT_FAILURE);
            }
            printf("%s\n", ip);
            exit(EXIT_SUCCESS);
    }

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_BY: Pejman Moghadam_  
_TAG: c, inet-aton, inet-ntoa_  
_DATE: 2011-02-23 00:14:00_