C++ Code Example: convert decimal to hexadecimal number

To convert a number from the decimal system to the hexadecimal system in C++ programming language, the following code example can be used.

#include <iostream>
using namespace std;

int main() {
    int num, remainder, decimal, product = 1;
    char c;
    string hex = "";

    cout << "Please enter a number: ";
    cin >> num;

    decimal = num;

    while (decimal != 0) {
        remainder = decimal % 16;
        if (remainder >= 10) {
            c = remainder + 55;
        } else {
            c = remainder + 48;
        }
            
        hex += c;
        decimal = decimal / 16;
        product *= 10;
    }

    reverse(hex.begin(), hex.end());

    cout << "Hexadecimal value of number: " << num << " is: " << hex << endl;
}

Output

Please enter a number: 1234
Hexadecimal value of number: 1234 is: 4D2