C++一道简单的问题

Question

凑字数 爱的你上课看到内地新疆地震局降低成本控制下不咸不淡经典的黑色家

Answer 1

#include <iostream>
#include <string>

using namespace std;

string convert(int num, int base) {
    static const char charset[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    int q = num / base;
    int r = num % base;
    if (q == 0) {
        return string(1, charset[r]);
    } else {
        return convert(q, base) + charset[r];
    }
}

int main() {
    string num;
    int K, T;
    cin >> num >> K >> T;

    int decimal = 0;
    int p = 1;
    for (int i = num.length()-1; i >= 0; i--) {
        char c = num[i];
        int digit = 0;
        if (c >= '0' && c <= '9') {
            digit = c - '0';
        } else if (c >= 'A' && c <= 'Z') {
            digit = c - 'A' + 10;
        }
        decimal += digit * p;
        p *= K;
    }

    string result = convert(decimal, T);
    cout << result << endl;

    return 0;
}