Write a C programming which can read the text file that contain 4 integers of an

Question

Write a C programming which can read the text file that contain 4 integers of an IP address along with a component to store up to 10 characters. Example of data file.txt look like: 123.89.72.45 water 147.12.5.74 salt 169.85.64.56 bottle 123.89.4.6 bag Then from that file, write code that can report the first 2 integers of the IP address associated with its name and save it as a file, as the following example: 123.89 water bag 147.12 salt 169.85 bottle Also, write code to arrange the name of IP address as alphabetical order, and save it as text file example: bag 123.89.4.6 bottle 169.85.64.56 salt 147.12.5.74 water 123.89.72.45

Explanation / Answer

Good question from you i have a small code similar to your question that will helps you.

Program to validate an IP address:

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#define DELIM "."

int valid_digit(char *ip_str)

{

    while (*ip_str) {

        if (*ip_str >= '0' && *ip_str <= '9')

            ++ip_str;

        else

            return 0;

    }

    return 1;

}

int is_valid_ip(char *ip_str)

{

    int i, num, dots = 0;

    char *ptr;

    if (ip_str == NULL)

        return 0;

    ptr = strtok(ip_str, DELIM);

    if (ptr == NULL)

        return 0;

    while (ptr) {

        if (!valid_digit(ptr))

            return 0;

        num = atoi(ptr);

        if (num >= 0 && num <= 255) {

            /* parse remaining string */

            ptr = strtok(NULL, DELIM);

            if (ptr != NULL)

                ++dots;

        } else

            return 0;

    }

    if (dots != 3)

        return 0;

    return 1;

}

int main()

{

    char ip1[] = "128.0.0.1";

    char ip2[] = "125.16.100.1";

    char ip3[] = "125.512.100.1";

    char ip4[] = "125.512.100.abc";

    is_valid_ip(ip1)? printf("Valid "): printf("Not valid ");

    is_valid_ip(ip2)? printf("Valid "): printf("Not valid ");

    is_valid_ip(ip3)? printf("Valid "): printf("Not valid ");

    is_valid_ip(ip4)? printf("Valid "): printf("Not valid ");

    return 0;

}

Sample Output:

Valid

Valid

For sortings strings alphabetical order we have:

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