Question on converting decimal to binary to hex [closed]

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I'm a little c开发者_开发知识库onfused here:

I'm trying to reverse engineer the ASCII value 65. In the book I am reading it says:

Decimal: 65
Hex:  41
Octal: 101

But 65 in its binary representation is:

0010 0001

And 0010 in hex is 2, while 0001 is 1, which indicates that the hex value "should" be: 21.

Where did I go wrong?

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65 dec in bin is 0100 0001.

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you have the binary wrong - it should be 0100 0001 - your bin to hex is fine

incidentally bin->oct->dec->hex is one of the things calc.exe is actually really useful for

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65 in decimal is:

 0100 0001

You're off by a digit in the first nibble.