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Practical 4 A

This C program contains functions to extract the individual octet values from an IP address string entered by the user and store them in an array. It then prints the IP address and determines its class (A, B, C, D or E) based on the value of the first octet.

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50 views2 pages

Practical 4 A

This C program contains functions to extract the individual octet values from an IP address string entered by the user and store them in an array. It then prints the IP address and determines its class (A, B, C, D or E) based on the value of the first octet.

Uploaded by

bhargeshpatel
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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#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;
}

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