Count Digits Of Number Program Example using CPP

Source Code:

#include <iostream>

using namespace std;

/*
Count No of Digits in Numbere
eg: if number N is 3421 Then
Digits of N = 4
*/

int main(int argc, char** argv) {

   // variable declarations
   int n; // For input Number
   int rem; // Used to store remainder
   int temp; // Used to save copy of input

   // Variable initialization
   int count = 0; // Store No. of digits

   cout<<"Please Input Number: ";
   cin>>n;

   // Copying into temp variable
   temp = n;

   while(temp > 0) { // until all digits are get
       rem = temp % 10; // calculating remainder
       temp = temp / 10; // reducing number
       count++; // increasing counter variable
   }

   cout<<"Total digits in "<<n<<" are: "<<count;

   return 0;
}

Output:

CPP program to count total digits in a number

Working:

This program example use while loop for counting total digits of a given number. This number is taken in a variable of integer type. This variable is named as n. Here is the detail of variables declared in this program along with their description and use.

Sr.	Identifier	Data Type	Description
1	n	int	It is used to store user input
2	rem	int	rem variable is used to store in while loop for storing remainder value.
3	temp	int	temp variable will store additional copy of user input.
4	count	int	It will work similar to counter variable, that holds the total number of iterations.

First of all we declare all required variables such as n, temp and rem. Here we also initialize another variable named as count. This count variable will be updated in while loop. Each time when an iteration will run this counter variable will incremented by 1. At the end of iterations we will print count variable which is holding total no of digits.

Here we also declare an additional variable which is named as temp. This temp variable will hold copy of input variable. We will use this temp variable in while loop. After completion of while loop this temp variable will become 0. We can also implement this algorithm using do while loop or for loop as well.