Description: The key points of the program lies in the function declaration, function declaration can not be omitted here, if the third and fourth lines of the function declaration: void add (int x, int y) void add2 (float x, float y) omitted add inside the functions defined in the next call add2: [add2 (x, y) ] will prompt an error, because of the declaration, the system does not know call add2 or the add what
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