问题
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Why are Hexadecimal Prefixed as 0x?
I just saw a comment a friend of mine made:
3x12=36
2x12=24
1x12=12
0x12=18
Which made me wonder..
Why did they choose 0x as prefix for hexadecimal numbers? Is there any history behind this decision?
回答1:
I think, because x comes from hex and 0 is to indicate that it is a number.
回答2:
0x means the number is probably hexadecimal. This applies in C/C++, and probalby other
languages.
His comment is a joke. he starts with multiplication tables for the number 12, but when he gets to 0 he implies that 0x is not "0 multiplied by...", but instead is "hexadecimal" so 12 in hex is 18 in decimal.
回答3:
It's a joke on HEX numbers from WIKIPEDIA.
The first three are interpreted as multiplication, but in the last, "0x" signals Hexadecimal interpretation of 12, which is 18.
回答4:
'0x' means that the number that follows is in hexadecimal. It's a way of unambiguously stating that a number is in hex, and is a notation recognised by C compilers and some assemblers
来源：https://stackoverflow.com/questions/4257661/where-does-0x-come-from