How would you prefix a hexadecimal number in C++?

In C++, to represent a hexadecimal number, the correct prefix is "0x". This prefix indicates that the number that follows is in base 16, allowing the compiler and the programmer to identify it as hexadecimal.

For example, if you wanted to define the hexadecimal number corresponding to decimal 255, you would write it as 0xFF. The "0x" tells the compiler that "FF" should be interpreted as a hexadecimal value.

Using "0h," "0b," and "0d" does not correctly denote a hexadecimal number in C++. "0h" is not a standard prefix recognized by C++, "0b" is used for binary numbers (base 2), and "0d" is used for decimal representation but is not commonly employed in practice. Hence, "0x" serves as the standard and universally recognized prefix for hexadecimal in the C++ programming language.