Check Strong Number

Check Strong Number in C++ (5 Programs)

IntermediateTopic: Advanced Number Programs
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C++ Check Strong Number Program

This program helps you to learn the fundamental structure and syntax of C++ programming.

Try This Code
#include <iostream>
using namespace std;

int factorial(int n) {
    if (n == 0 || n == 1) return 1;
    return n * factorial(n - 1);
}

bool isStrong(int num) {
    int original = num;
    int sum = 0;
    
    while (num > 0) {
        int digit = num % 10;
        sum += factorial(digit);
        num /= 10;
    }
    
    return sum == original;
}

int main() {
    int num;
    cout << "Enter a number: ";
    cin >> num;
    
    if (isStrong(num)) {
        cout << num << " is a Strong number" << endl;
    } else {
        cout << num << " is not a Strong number" << endl;
    }
    
    return 0;
}
Output
Enter a number: 145
145 is a Strong number

Understanding Check Strong Number

A Strong number is a number where the sum of factorials of its digits equals the number itself. For example, 145 = 1! + 4! + 5! = 1 + 24 + 120 = 145. This program demonstrates 5 different methods to check for strong numbers.

Note: To write and run C++ programs, you need to set up the local environment on your computer. Refer to the complete article Setting up C++ Development Environment. If you do not want to set up the local environment on your computer, you can also use online IDE to write and run your C++ programs.

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Calculate Power of a Number
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Calculate Power of a Number

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