First, a library(lib) is not a couple of functions. In general, a "lib" refers to a .lib file(a collection of re-usable code).
Second, system("pause") is a highly expensive operation(resource wise). I advise you not to use this, and especially not to advise others to use this.
Here's a small article that briefly explains some alternatives to system("pause"):
Things to Avoid in C/C++ system("pause")
In my opinion, you shouldn't be releasing anything related to C++ without at least a year's experience. Your time is better spent learning than making a feeble attempt at helping others(especially when you may be wrong in the first place).