十进制转十六进制

dec_to_hex.cpp

#include <iostream>
#include <algorithm>

using namespace std;

void dec_to_hex(long long &dec) {
    string hex;
    if (dec == 0) {
        hex = "0";
    }
    while (dec != 0) {
        long long temp = dec % 16;
        if (temp >= 0 && temp <= 9) {
            hex += (char) (temp + 48);
        } else {
            hex += (char) (temp + 55);
        }
        dec /= 16;
    }
    reverse(hex.begin(), hex.end());

    cout << hex << endl;
}

int main() {
    long long num;
    cin >> num;
    dec_to_hex(num);
    return 0;
}