numb.c

#include <stdio.h>

#include <string.h>

 

/*

Function : extractIpAddress

Arguments : 

1) sourceString - String pointer that contains ip address

2) ipAddress - Target variable short type array pointer that will store ip address octets

*/

void extractIpAddress(unsigned char *sourceString,short *ipAddress)

{

    unsigned short len=0;

    unsigned char  oct[4]={0},cnt=0,cnt1=0,i,buf[5];

 

    len=strlen(sourceString);

    for(i=0;i<len;i++)

    {

        if(sourceString[i]!='.'){

            buf[cnt++] =sourceString[i];

        }

        if(sourceString[i]=='.' || i==len-1){

            buf[cnt]='\0';

            cnt=0;

            oct[cnt1++]=atoi(buf);

        }

    }

    ipAddress[0]=oct[0];

    ipAddress[1]=oct[1];

    ipAddress[2]=oct[2];

    ipAddress[3]=oct[3];

}

int main()

{

    unsigned char ip[20]={0};

    short ipAddress[4];

     

    printf("Enter IP Address (xxx.xxx.xxx.xxx format): ");

    scanf("%s",ip);

     

    extractIpAddress(ip,&ipAddress[0]);

     

    printf("\nIp Address: %03d. %03d. %03d. %03d\n",ipAddress[0],ipAddress[1],ipAddress[2],ipAddress[3]);

    

    if(ipAddress[0]>=0 && ipAddress[0]<=127)

        printf("Class A Ip Address.\n");

    if(ipAddress[0]>127 && ipAddress[0]<191)

        printf("Class B Ip Address.\n");

    if(ipAddress[0]>191 && ipAddress[0]<224)

        printf("Class C Ip Address.\n");

    if(ipAddress[0]>224 && ipAddress[0]<=239)

        printf("Class D Ip Address.\n");

    if(ipAddress[0]>239)

        printf("Class E Ip Address.\n");

     

    return 0;

}