Functions are very important in C++, as you can't write the simplest program to print hello without using a function. Overall you can say that function are building blocks of a C++ program.
Functions can also be defined by the programmer to reduce program size.
C programs do not function without functions.
One.
It should work without any special action.
Yes, there can be friend functions in C++.
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.
Yes, you can program games with C++.
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.
If you declare a variable inside of any fuction (except main) it will not be available to other functions.
No, they are functions. Operators are -> or ++or /=
Of course they are used. Both stand-alone and class-member functions are used in C++.
Exit the program and relaunch it.
The main program is itself just a function. Its only purpose is to serve as the entry point of the application. All other functions, whether built-in or user-defined, are just ordinary functions that can be called at any time so long as they are within the scope of the caller.