Hex to Binary Converter - Free Online Tool with Table & Calculator

#include <iostream>
#include <string>
#include <bitset>
#include <sstream>

class HexToBinaryConverter {
public:
    // Hex to Binary C++ - Method 1: Using bitset
    static std::string hexToBinary(const std::string& hex) {
        std::stringstream ss;
        for (char c : hex) {
            int value = (c >= '0' && c <= '9') ? c - '0' : 
                       (c >= 'A' && c <= 'F') ? c - 'A' + 10 :
                       (c >= 'a' && c <= 'f') ? c - 'a' + 10 : 0;
            std::bitset<4> binary(value);
            ss << binary;
        }
        return ss.str();
    }
    
    // Hex to Binary C++ - Method 2: Manual conversion table
    static std::string hexToBinaryManual(const std::string& hex) {
        std::string hexToBinTable[] = {
            "0000", "0001", "0010", "0011", "0100", "0101", "0110", "0111",
            "1000", "1001", "1010", "1011", "1100", "1101", "1110", "1111"
        };
        
        std::string result;
        for (char c : hex) {
            int index = (c >= '0' && c <= '9') ? c - '0' : 
                       (c >= 'A' && c <= 'F') ? c - 'A' + 10 :
                       (c >= 'a' && c <= 'f') ? c - 'a' + 10 : 0;
            result += hexToBinTable[index];
        }
        return result;
    }
};

// Hex to Binary C++ calculator example
int main() {
    std::string hexInput = "A3F";
    std::string result1 = HexToBinaryConverter::hexToBinary(hexInput);
    std::string result2 = HexToBinaryConverter::hexToBinaryManual(hexInput);
    
    std::cout << "Hex to Binary: " << hexInput << " = " << result1 << std::endl;
    std::cout << "Manual method: " << hexInput << " = " << result2 << std::endl;
    return 0;
}