Mailinglist Archive: opensuse (2532 mails)

[Anders Johansson <ajh@xxxxxxxxxx>]

On Sunday 04 May 2008 03:19:29 David C. Rankin wrote:
> Listmates,
>
>       I was comparing input handling between perl and c and I ran into a very
> weird problem with the strtof function in c. What am I doing wrong? strtof
> doesn't seem to be working like the man page shows. Here is my test bit of
> code:
[...]
>       The code compiles without error or warning with: "gcc -o prg/tmp
> src/tmp.c" Here is the bewildering output:

Well, no it doesn't. It says "implicit declaration of stdtof"

If you read the man page for strtof it says

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       strtof(),  strtold():  _XOPEN_SOURCE >= 600   ||   _ISOC99_SOURCE;   or
       cc -std=c99

So try

gcc -std=c99 -o prg/tmp src/tmp.c

Without that -std=c99, gcc simply doesn't know what strtof() is, and calls it 
incorrectly (it assumes it accepts an int as parameter and returns an 
integer, and generates assembly accordingly. You're unlucky you got bad 
data - the 'good' return value would have been a seg fault)

Anders
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