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4-4 User Function Without Return Value

The fourth will will describe the concept of functions (book chapter 8). We will motivate the use of function by system functions, including mathematic and input/output functions, so we the students can understand the key concept that if we can use existing code, then we do not need to reinvent the wheel. Then we will introduce the way to define our own functions. The key mechanism of function call, parameter passing, and return values wiill be discussed by a series of examples.

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