how to make value = strtol (number.c_str(),NULL, number.size()); work?

Question

Number is a string == "0x1388" which is 5000 in dec. I'm not sure how to convert this hex string into the int value == 0x1388; Any help? And thanks in advance.

    value = strtol (number.c_str(),NULL, number.size());

http://stackoverflow.com/questions/1070497/c-convert-hex-string-to-signed-integer — IdeaHat, Dec 20 '13 at 18:32

score 0 · Answer 1 · answered Dec 20 '13 at 18:33

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The third argument is the base of the number you want to convert. In your case, the number is base 16 (hexadecimal), so you should pass 16 as the third argument. You can also pass 0, which will let the function determine the base from the prefix 0x.

answered Dec 20 '13 at 18:33

Joseph Mansfield

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score 0 · Answer 2 · answered Dec 20 '13 at 18:36

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Fix 3rd argument

value = strtol (number.c_str(),NULL, 16);
                                      ^^ Base of hexadecimal number

answered Dec 20 '13 at 18:36

P0W

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Would this work for Octal and Dec too? – user2904033 Dec 20 '13 at 18:48
@user2904033 Yes, why not ? – P0W Dec 20 '13 at 18:55

how to make value = strtol (number.c_str(),NULL, number.size()); work?

2 Answers2