Check if a number is contiguous to each other !

 #include <stdio.h>

# include <math.h>

int main (){

int num,s,m,lim,Nnum;

printf("enter the number : \n");

scanf("%d",&num);

printf("Enter the matching Number : \n");

scanf("%d",&s);

m = ceil(log10(num));

//printf("%d",m);

lim = m -3;

Nnum = num / (pow(10,lim));

if(Nnum == s){

printf("N1 is contigeous");

} else {

printf("N1 is not !");

}

}