API In C

API's are very important in any language but the problem is that i don't know how to use them in C

is there any guide that can help me ?

The main question is what api would you like to use..

For instance, here is some info on the curl api in C http://curl.haxx.se/libcurl/c/
And here is MaxiMind's terrific GeoIP api in C http://www.maxmind.com/app/c

Hope this is of some help to you..

i suggest you go to the msdn site, they listed the API's and with most of them there is an example source code in C/C++.

here is an example for the GetLocalTime API.

Well I surely have to thank all of you for your help

the websites mentioned by the_JinX were very useful and so was MSDN,
i have the MSDN collection but its old ! '98

Well, let's hope we've helped you solve you problem then ;)

yeh thanks for the help