## Armstrong Number Program in C++

To check if given number n is Armstrong Number in C++, find the sum of cubes of individual digits in given number, and check if the sum equals the given number.

In the following program, we read a number to n from user via console input, and check if this number is Armstrong Number or not.

C++ Program

```#include <iostream>
using namespace std;

int main() {
int n;
cout << "Enter a number : ";
cin >> n;

int sum = 0;
int digit;
int temp = n;
while (temp > 0) {
digit = temp % 10;
sum = sum + (digit * digit * digit);
temp = temp / 10;
}

if (sum == n) {
cout << "An Armstrong Number." << endl;
} else {
cout << "Not an Armstrong Number." << endl;
}
}```

Output

```Enter a number : 371
An Armstrong Number.
Program ended with exit code: 0```
```Enter a number : 123
Not an Armstrong Number.
Program ended with exit code: 0```

We have used C++ While Loop for iteration, and C++ If Else statement for decision making.

### Conclusion

In this C++ Tutorial, we learned how to check if given number is an Armstrong Number, with example.