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C++ program to find the sum of all digits of a number using class

Submitted by Shubh Pachori, on August 22, 2022

Problem statement

Given a number, we have to find the sum of all digits of a number using the class and object approach.

Example:

Input:
Enter Number: 12345

Output:
Sum of all digits of the number is 15

C++ code to find the sum of all digits of a number using the class and object approach

#include <iostream>

using namespace std;

// create a class
class Sum {
  // private data member
  private:
    int number;

  // public functions
  public:
    // getNumber() function to get the number
    void getNumber() {
      cout << "Enter Number:";
      cin >> number;
    }

  // add() function to find the Sum of 
  // all digits of the number
  int add() {
    int sum = 0, remain;

    while (number) {
      // the last digit of number is stored 
      // in remain by % operator
      remain = number % 10;

      // remain is added in the sum
      sum = sum + remain;

      // number is divided by 10 to 
      // discard the last digit
      number = number / 10;
    }

    // returning the sum
    return sum;
  }
};

int main() {
  // create an object
  Sum S;

  // int type variable to store the 
  // sum of all digits in it
  int sum;

  // function is called by the object to 
  // store the number
  S.getNumber();

  // add() function to add all digits 
  // of the number
  sum = S.add();

  cout << "Sum of all digits of the number is " << sum;

  return 0;
}

Output

Enter Number:9876
Sum of all digits of the number is 30

Explanation

In the above code, we have created a class named Sum, an int type data member number to store the number, and public member functions getNumber() and add() to store and find out the sum of all digits of the given number.

In the main() function, we are creating an object S of class Sum, reading an integer number by the user using getNumber() function, and finally calling the add() member function to find out the sum of all digits of a given integer number. The add() function contains the logic to find out the sum of all digits of the given number and printing the result.

C++ Class and Object Programs (Set 2) »