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Can someone help me how to add 2 hexadecimal numbers?

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Younghun Kim
Younghun Kim 2020-6-13
编辑： Walter Roberson 2020-6-13
I have ha and a as string, and I want to add 2 hexadecimal numbers.
ha = '6a09e667f3bcc908'
fn_bin2hex(a) = '73a54f399fa4b1b2'
Can someone help me how to add 2 hexadecimal numbers?
I tryed hex2dec and add 2 number,, but it doesn't work because these numbers are too big.
Is there a correct way to do this?
  2 个评论
Walter Roberson
Walter Roberson 2020-6-13
hex2num() is limited to double, and so cannot be used with values greater than 0x20000000000000

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采纳的回答

Ameer Hamza
Ameer Hamza 2020-6-13
If you have symbolic toolbox, then define a function like this
hexsum = @(a, b) dec2hex(sum(str2sym({['0X' a], ['0X' b]})));
Example
ha = '6a09e667f3bcc908';
hb = '73a54f399fa4b1b2';
hc = hexsum(ha, hb);
Result
>> hc
hc =
'DDAF35A193617ABA'
  4 个评论
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Younghun Kim
Younghun Kim 2020-6-13
I'm sorry to say this, but there's a problem.
I did addition another 2 num.
'3c6ef372fe94f82b' + 'd67806db8b148677'
ans =
'112E6FA4E89A97EA2'
I think it has to be '12e6fa4e89a97ea2'
Why is one bit stuck in front? I don't know why...... :(
Walter Roberson
Walter Roberson 2020-6-13
编辑：Walter Roberson 2020-6-13
'112E6FA4E89A97EA2' is correct, and your expectation of '12e6fa4e89a97ea2' is incorrect.
Look at the top nibble: you are adding 3 + d, which is 3 + 13, and that is going to overflow. Therefore the result must have one more digit than the inputs, 17 output digits when the inputs are 16 digits each.

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