题解 | #十进制整数转十六进制字符串#

#include <cctype>
#include <ios>
#include <iostream>
#include <sstream>
#include <string>
#include <algorithm>
using namespace std;

string toHexString(int n);

int main() {

    int n;
    cin >> n;

    string hexStr = toHexString(n);
    cout << hexStr << endl;

    return 0;
}

string toHexString(int n) {
    // write your code here......
    ostringstream os;
    os << hex << n;

    string s {os.str()};
    transform(s.begin(), s.end(), s.begin(), ::toupper);

    return s;
}