C++ Basic Programming Examples

C++ Program to check If a given number is an Armstrong number or not

The Program inC++ Program to check If a given number is an Armstrong number or not are given below:

#include <iostream>
#include <cmath>

using namespace std;

int number_of_digits(int n) {
    int count = 0;
    while (n != 0) {
        count++;
        n /= 10;
    }
    return count;
}

bool is_Armstrong(int n) {
    int num_of_digits = number_of_digits(n);
    int sum = 0;
    int original_num = n;
    while (n != 0) {
        int digit = n % 10;
        sum += pow(digit, num_of_digits);
        n /= 10;
    }
    return original_num == sum;
}

int main() {
    int n;
    cout << "Hello Codeauri Family,Enter a number here to check whether the given number is Armstrong Number or not!:\n ";
    cin >> n;
    if (is_Armstrong(n)) {
        cout << n << " is an Armstrong number." << endl;
    } else {
        cout << n << " is not an Armstrong number." << endl;
    }
    return 0;
}

Output:


Hello Codeauri Family,Enter a number here to check whether the given number is Armstrong Number or not!:
153
153 is an Armstrong number.

Pro-Tips💡

In this program, the user is prompted to enter a number, and the program then calls the is_Armstrong function to determine if the number is an Armstrong number.

If it is, the program prints that the number is an Armstrong number.

If not, the program prints that the number is not an Armstrong number.

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