What is 0x3D (base 16) in decimal (base 10)? There is a thing called ASCII table that contains data in different formats. For example, the ASCII 65 corresponds to the HEX -> 41 and the symbol ‘A’. These values are all equal, but in different representations. You can take a look at ASCII Codes Table. Image Credit: ASCII Codes Table You have to keep in mind that hex values can start with 0x....