WAP to 1+11+111+..........+n

#include <iostream>

using namespace std;

int main() {
    int n;
    cout << "Enter the value of n: ";
    cin >> n;

    int s = 0;
    int term = 1;
    int multiplier = 1;

    for (int i = 1; i <= n; i++) {
        s += term;
        multiplier *= 10;
        term = term * 10 + 1;
    }

    cout << "The sum of the series is: " << s << endl;

    return 0;
}

Output 1:-

Enter the  value of n: 2

the sum of the series is: 12

Output 2:-

Enter the  value of n: 5

the sum of the series is: 12345