How do I convert a decimal number to hexadecimal in C++?

How do I convert a decimal number to hexadecimal in C++?

You can use the std::hex manipulator along with std::cout to convert a decimal number to hexadecimal. Here's a simple example:

#include <iostream>
using namespace std;

int main() {
    int decimalNumber = 255;
    cout << "Hexadecimal: " << hex << decimalNumber << endl;
    return 0;
}

What if I want to convert a user input decimal number?

You can use cin to get user input. Here's how you can modify the previous example:

#include <iostream>
using namespace std;

int main() {
    int decimalNumber;
    cout << "Enter a decimal number: ";
    cin >> decimalNumber;
    cout << "Hexadecimal: " << hex << decimalNumber << endl;
    return 0;
}

Can I convert larger numbers as well?

Yes, you can convert larger numbers too! Just ensure that the variable type can hold the value. For example, use long long for very large numbers.

Is there a way to format the output with leading zeros?

Yes, you can use std::setw and std::setfill from the <iomanip> header to format the output. Here's an example:

#include <iostream>
#include <iomanip>
using namespace std;

int main() {
    int decimalNumber = 255;
    cout << "Hexadecimal: " << setfill('0') << setw(4) << hex << decimalNumber << endl;
    return 0;
}