//This program will convert a number string into a number of digits

#include<iostream>

#include "stdio.h"

using namespace std;

int ATOI(char *str)

{

int n=0;

while(*str)

{

n = n*10 + (*str - '0');

++str;

}

return n;

}

int main()

{

char buffer[200];

cout<<"Enter a number of any digit: ";

cin>>buffer;

printf("%d", ATOI(buffer));

return 0;

}