C Example for Beginners: C Program to Count Number of Digits in an Integer

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(C programming Example for Beginners)

C Program to Count Number of Digits in an Integer

In this example, you will learn to count the number of digits in an integer entered by the user.


This program takes an integer from the user and calculates the number of digits. For example: If the user enters 2319, the output of the program will be 4.


Program to Count the Number of Digits


#include <stdio.h>
int main(){
    long long n;
    int count = 0;
    printf("Enter an integer: ");
    scanf("%lld", &n);
 
    // iterate until n becomes 0
    // remove last digit from n in each iteration
    // increase count by 1 in each iteration
    while (n != 0) {
        n /= 10;     // n = n/10
        ++count;
    }

    printf("Number of digits: %d", count);
}

Output

Enter an integer: 3452
Number of digits: 4

  • After the first iteration, the value of n will be 345 and the count is incremented to 1.
  • After the second iteration, the value of n will be 34 and the count is incremented to 2.
  • After the third iteration, the value of n will be 3 and the count is incremented to 3.
  • After the fourth iteration, the value of n will be 0 and the count is incremented to 4.
  • Then the test expression of the loop is evaluated to false and the loop terminates.

 

C Example for Beginners: C Program to Count Number of Digits in an Integer

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