#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int
check_digit_dot(char ipstr[])
{
for(int i=0;i<strlen(ipstr);i++)
{
if((ipstr[i]>=48 &&
ipstr[i]<=57)||(ipstr[i]=='.'))
{
//i++;
}
else
{
return 0;
}
}
return 1;
}
int
check_ip(char ipstr[])
{
char temp[20];
int a,num,dot=0,j=0,numcount=0;
a=check_digit_dot(ipstr);
temp[0]='\0';
if(a==0)
return 0;
else
{
for(int i=0;i<=strlen(ipstr);i++)
{
if(ipstr[i]!='.')
{
temp[j]=ipstr[i];
j++;
temp[j]='\0';
}
else
{
num=atoi(temp);
cout<<"num="<<num<<"\n";
dot++;
if((num>=0 && num<=255)
&& strlen(temp)>0)
{
numcount++; }
cout<<"numcount="<<numcount<<"\n";
j=0;
temp[j]='\0';
}
}
// after last dot
num=atoi(temp);
cout<<"num="<<num<<"\n";
if ((num>=0 && num<=255)
&& strlen(temp)>0)
{ numcount++; }
cout<<"numcount="<<numcount<<"\n";
}
cout<<"dots="<<dot<<"
numcount="<<numcount<<"\n";
if(dot==3 && numcount==4)
return 1;
else
return 0;
}
void
main()
{
clrscr();
char a[50];
int check;
cout<<" enter ip address\n";
cin>>a;
check=check_ip(a);
if(check==1)
{
cout<<"valid ip address";
}
else
{
cout<<"not valid address";
}
getch();
}
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