double到hex string和hex string to double

#include<iostream>
#include<string>
#include <sstream>
#include <iomanip>

std::string doubleToHexString(double value) {
    std::stringstream stream;
    stream<< std::hex<< std::uppercase<< value;
    return stream.str();
}

int main() {
    double value = 123.456;
    std::string hexString = doubleToHexString(value);
    std::cout << "Hex string: "<< hexString<< std::endl;
    return 0;
}

#include<iostream>
#include<string>
#include <sstream>
#include <iomanip>

double hexStringToDouble(const std::string& hexString) {
    std::stringstream stream;
    stream<< std::hex<< hexString;
    double value;
    stream >> value;
    return value;
}

int main() {
    std::string hexString = "1E240";
    double value = hexStringToDouble(hexString);
    std::cout << "Double value: "<< value<< std::endl;
    return 0;
}