Is there any biult-in function to convert from hex to chararray

[kwnan]

I am new user to C++ and would like to know if there is any biult-in function to convert from hex to chararray?

Regards

[Stewbond]

Define "hex".

Are you talking about a hex string such as "0x5bac", a hex string such as "5bac", a hex number such os 0x5bac?

You can use these functions. I wrote them with the Qt QChar and QString classes and haven't tested them with the std:: containers.

unsigned int ToNum(char in)
{
    int out = in;
    if (out >= 'A' && out <= 'F')
        out -= ('A' - 10);
    else if (out >= 'a' && out <= 'f')
        out -= ('a' - 10);
    else
        out -= '0';
    return out;
}

unsigned int str2num(std::string num, int base)
{
    unsigned int output = 0;
    for (int i = 0; i < num.length(); ++i)
    {
        output *= base;
        output += ToNum(num.at(i));
    }
    return output;
}

unsigned int str2dec( std::string str)
{
    return str2num(str, 10);
}

unsigned int str2hex( std::string str)
{
    if (str.length() > 2)
        if (str.at(0) == '0' && (str.at(1) == 'x' || str.at(1) == 'X'))
            str.erase(0,2);

    return str2num(str, 16);
}

unsigned int str2bin( std::string str)
{
    return str2num(str, 2);
}

double str2doub(std::string str)
{
    std::stringstream iss(str);
    double out;
    iss >> out;
    return out;
}

You would use it like:
std::cout << str2num(0x5bac, 8);

[Peter87]

It is not clear what you want. Do you want to convert an integer to a string in hex format? In that case you can use std::ostringstream.

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

int main()
{
	int n = 0x80;
	std::ostringstream oss;
	oss << std::hex << n;
	std::string str = oss.str();
}