I want to convert a string (ex: 567.2.2.2) into integer or array of integer and i have to check 567 is greater then or less than 256 or not and i have to dispaly. this string is in a file

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Oct 25th, 2006
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raja

May 7th, 2007

#include<stdlib.h>
int main()
{
char s[]="567.2.2.2";
int a;
a=atoi(s);
if(a>256)
printf("%d is greater",a);
else
printf("%d is smaller",a);
}
atoi function which converts string to integer which returns integer 567 in this program