How to Print Unsigned Char as Hex in C Using Ostream?

Printing Unsigned Char as Hex in C Using Ostream

To print unsigned 8-bit variables (unsigned char or uint8_t) in hexadecimal using ostream in C , consider the following solutions:

Using Casting with Hex Manipulator

You can use a cast to convert the unsigned char to an int before using the hex manipulator:

Using Custom Manipulator

MartinStettner provided an elegant custom manipulator called hexchar that simplifies hex printing:

This will produce the desired output:

Using Macro (Less Preferred)

As an alternative, you can define a macro to automate the process, though this is less idiomatic in C :

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