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Editorial Team
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Asked: 2026-05-26T11:48:41+00:00

I have an input argument string const char* s I know that it starts

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I have an input argument string const char* s
I know that it starts the sequence of chars which are integers representation ,this sequence could be of any length ,including 0.
After the integer sequence follows sequence of chars which are not integer representation.
for example "23meeting","1h".
Is there some (builtin) C function which can extract the integer?
For example for “23meeting” such operation could be performed : 

int x = needed_function("23meeting"); //results x = 23

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1 Answer

  1. Editorial Team

    atoi() should work fine for this. It should stop at the first non-numeric character.

    int x = atoi("23meeting")

    EDIT: A comment implies that atoi() is not thread safe or is deprecated from the language. There is some discussion of the thread safety of this function here:

    Why does OSX document atoi/atof as not being threadsafe?

    Can someone provide a reference to atoi not being thread safe?

    And as far as I can tell atoi() is in C99 which is the latest standard (7.20.1.2).

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