fixed warning, formatted code, made it compatible with Linux and macOS #1
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Things I changed:
I have fixed main.cpp:99:1: warning: non-void function does not return a value [-Wreturn-type]
I have formatted the code to be easier to read.
I have replaced system("pause"); with systemPause(); which is implemented on line 106.
It does the same thing as system("pause"); but now your code isn't Windows exclusive.
Using conditional compiling at lines 118-122, screen clearing will work on all major platforms (Windows, Linux and macOS).