Can someone help me how to add 2 hexadecimal numbers?
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Younghun Kim
le 13 Juin 2020
Modifié(e) : Walter Roberson
le 13 Juin 2020
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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 commentaires
Walter Roberson
le 13 Juin 2020
hex2num() is limited to double, and so cannot be used with values greater than 0x20000000000000
Réponse acceptée
Ameer Hamza
le 13 Juin 2020
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 commentaires
Walter Roberson
le 13 Juin 2020
Modifié(e) : Walter Roberson
le 13 Juin 2020
'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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