Converting to and from hex

tofromhex.cpp

#include<bits/stdc++.h>
using namespace std;

string toHex(int n) {
    string result;
    while (n) {
        int rem = n % 16;
        result += (rem < 10) ? (rem + '0') : ('A' + rem - 10);
        n /= 16;
    }
    reverse(result.begin(), result.end());
    return result;
}

int toDec(string hex) {
    int result = 0;
    for (size_t i=0; i<hex.size(); i++) {
        char d = hex[hex.size() - i - 1];
        int p = 0;
        if (isdigit(d)) {
            p = d - '0';
        } else {
            p = 10 + d - 'A';
        } else {
            cout << "Something went wrong.\n";
        }
        result += p * pow(16, i);
    }
    return result;
}

int main(){
    cout << ('B' - 'A' + 10);
}