Introduction to Programming (CS201) - Function that count the length of Number

// This program is calling a function to calculate the length of any number.

#include <iostream>

using namespace std;

//Function declaration
int countN ( int );

main( )
{
int num;
cout << "\n No. of digits in given number is: " << countN(num);
}



// function to calculate the power of some number

int countN ( int i )
{ 
int a, num; 

cout<<"Enter any num : ";
cin>>num;

while(num>0)
{
num=num/10;
a++;
}
return a;
}