atoi() from hex representation string

Question

Need to make int from hex representation string like "0xFA" or better "FA". Need something like atoi("FA"). Is there are any standard solutions for that?

Something like [`strtol`](http://en.cppreference.com/w/c/string/byte/strtol), you mean? — Jongware, Dec 18 '13 at 09:42

score 83 · Accepted Answer · edited Dec 18 '13 at 10:20

83

Try to use strtol():

strtol("FA", NULL, 16);

edited Dec 18 '13 at 10:20

alk

69,737
10
105
255

answered Dec 18 '13 at 09:42

V-X

2,979
18
28

1

Note: it also works with `0xFA`: "(optional) prefix (0x or 0X) indicating hexadecimal base (applies only when the base is 16 or 0)" – Jongware Dec 18 '13 at 09:44
28

For unsigned, you should use strtoul() to properly handle strings like "0x81234567", otherwise you will get 0xFFFFFFFF returned. – gjcamann May 13 '14 at 15:56

atoi() from hex representation string

1 Answers1

Linked