Thread: how do i use ln function in c programming

ok so im new to programming and im using the microsoft visual studio c++.

i need to do the equation t=(-R*C) * ln(1-VC/VS) however i have no idea how to include the ln function, i have included the cmath library in the header file and i've searched it and can't find how to include it in my programme.

Any help would be appreciated

Thanks
Baronator

If you are using C++, pls post to C++ forum.

The log() function returns the natural logarithm of x.

You have to make it yourself It's simple