Hi.
-----
Thanks for reading ...

I want to write for example: ln 3

Is there is any command or function for it ...!

we have a direct support for the logarithmic functions in c.
include math.h in your program and this solves the problem of find ln 3..
this ln 3 is similar to log(3);
i think the site mentioned by mahsa_c++ also helps your problem..
thanks.
please help me in using system(); in c++
please....

Dear Sharathg ,

System() functions in C or C++ provides you to perform command prompt ( or Shell) command in your program. usually typing the very same command that u do in a shell, in the argument field of the system( ... ) function will lead to the performance of that command.
For example in a cmd ( command prompt ) in windows typing "cls" clears the console. now typing

system("cls");

will clear the program console.

My searches said to me that there is a very similar discussion in daniweb in here :
http://www.daniweb.com/forums/thread82942.html

and also, i guess you'll need to include the file <windows.h> in your file too.

Regards
Mahsa

and why doesnt this code open the file specified located in the same directory??

system("type hello.txt");

please explain

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