AP Computer Science Workshop

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C++ Functions

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In C++

• everything is a function
• a procedure is a function that doesn't return anything (a void function):

  Pascal Procedure Example:

      procedure Foo (x, y : real; var a, b : integer);
      begin
  
      end;
  

  C++ Function Example:

      void Foo(double x, double y, int & a, int & b)
      {
  
      }
  
      Foo(3, 4, one, two);
  

A function that takes no parameters has an empty parameter list:

      void PrintInstructions( )
      {
            cout << ...
      }

But be very careful with functions that take no parameters:

      PrintInstructions( );

is not the same as

      PrintInstructions;

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Mark Stehlik, Carnegie Mellon University