Oct 11, 2011

C Program to convert IP address to 32-bit long int

C Program to convert IP address to 32-bit long int. Internet Protocol Address is the unique number assigned to the each device, which is connected to the computer network. Previously we are using IPv4 versions, now we are using IPv6. Here we read the ip address using unions, and converted that to the 32-bit long int. Read more about C Programming Language .

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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
union iptolint
 char ip[16];
 unsigned long int n;
unsigned long int conv(char []);

 union iptolint ipl;
 printf(" Read the IP Address to be converted\n");
 printf(" Equivalent 32-bit long int is : %lu\n",ipl.n);

unsigned long int conv(char ipadr[])
 unsigned long int num=0,val;
 char *tok,*ptr;
 while( tok != NULL)
  num=(num << 8) + val;

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