C++ Program to check a number is unique or not


In this program, You will learn how to check a number is unique or not in C++.


Some list of unique numbers is: 1, 2, 12, 23, 234

- Unique number no repeat the digit of number

Example: How to check a number is unique or not in C++.

#include<iostream>
using namespace std;

int main() {

    int n, num, i, j, r, k = 0, flag = 1;
    int arr[100];

    cout << "Enter a number:";
    cin>>n;

    num = n;
    while (n > 0) {

        r = n % 10;
        arr[k] = r;
        n = n / 10;
        k++;
    }

    for (i = 0; i < k; i++) {
        for (j = i + 1; j < k; j++) {
            if (arr[i] == arr[j]) {
                flag = 0;
            }
        }
    }
    if (flag == 1) {
        cout << "Number is unique:" << num;
    } else {
        cout << "Number is not unique:" << num;
    }

    return 0;
}

Output:

Enter a number:3241
Number is unique:3241

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