1. In C language, you cannot compile a source-file if it has two (or more) functions with the same name.
2. You cannot link a program if it has two (or more) global (ie: non-static) functions with the same name.
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If you declare a variable inside of any fuction (except main) it will not be available to other functions.
Every C plus plus program that is a main program must have the function 'main'.
In C and C++, as well as in many (all?) languages, a function can be called from more than one place in a program. That's the purpose of functions - to encapsulate pieces of code that are needed in more than one place in the program.
There is no such thing. You probably meant the main function. The main function is the only function that is required as it serves as the entry point of the program.
Its limited only by available memory.