How to Convert Integers to Hexadecimal Strings in C ?

Converting Integers to Hexadecimal Strings in C

In C , converting an integer to a hexadecimal string can be achieved using the header's std::hex manipulator. Printing the converted string can be done through std::cout, while using std::stringstream is an option for capturing the result as a string.

To use std::hex, simply insert it before the integer you want to convert:

std::stringstream stream;
stream << std::hex << your_int;
std::string result(stream.str());

You can also add prefixes to the hexadecimal representation, such as "0x", by including it in the first insertion:

stream << "0x" << std::hex << your_int;

Other manipulators of interest are std::oct (octal) and std::dec (decimal).

One potential challenge is ensuring the hexadecimal string has a consistent number of digits. To address this, you can use std::setfill and std::setw:

stream << std::setfill('0') << std::setw(sizeof(your_type) * 2) << std::hex << your_int;

Finally, here's a suggested function for converting integers to hexadecimal strings:

template<typename T>
std::string int_to_hex(T i)
{
  std::stringstream stream;
  stream << "0x" << std::setfill('0') << std::setw(sizeof(T) * 2) << std::hex << i;
  return stream.str();
}

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