Adding string and int as hexadecimal

Question

I want to add two hexadecimal numbers in hex mode and result should also be hexadecimal. But the problem is I have a string "20010000" and int 0x400050, how should I add those to receive 0x20410050 ?

Ive tried int.Parse with various hex options but it always results as decimal addition.

Can you share some variable declarations? Is it string foo = "20010000"; int bar = 0x400050;? If so, I think your question is just "How do I parse a string as a hexadecimal number?" Right? — user94559
– user94559, Commented Jul 24, 2016 at 22:22
how to add bar to foo like both were hex and receive hex number. Its more like "How to parse string as hex but leave its value", when I were searching for solution, only "how to parse decimal string to hex int" pops up. — erexo
– erexo, Commented Jul 24, 2016 at 22:25
I'm doing a lot of guessing as to what you actually want, but see if my answer helps. — user94559
– user94559, Commented Jul 24, 2016 at 22:29

user94559 · Accepted Answer · 2016-07-24 22:25:29Z

1

Is this what you're looking for?

string aString = "20010000";
int a = Convert.ToInt32(aString, 16); // should be 536936448
int b = 0x400050; // should be 4194384

int sum = a + b; // should be 541130832
string sumString = sum.ToString("X"); // should be "20410050"
string sumStringWithPrefix = "0x" + subString; // should be "0x20410050"

answered Jul 24, 2016 at 22:25

user94559

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1 Comment

erexo Over a year ago

Thats what Ive been looking for, was trying something simillar before but for some reason it doesnt works. Thanks for your reply

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