NET provides many built-in functions to assist your coding or applications.
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Therefore, a function call must be assigned to a variable of the type that the function returns: VariableName = FunctionName(ParameterList) The following code calls a UCase function to return an uppercase representation of a String that is passed as a parameter: strVariableName = UCase(“please uppercase this”)Ĭhapter 5 – Subroutines and Functions 5.2 Built-In Functions Visual Basic. Subroutines are invoked using a subroutine name: SubroutineName(ParameterList) Invoking a subroutine can occur with parameters: OutputMin(intValue1, intValue2) Invoking a subroutine can also occur without parameters: Message()Ĭhapter 5 – Subroutines and Functions Invoking a Function Call A function by definition has a return value.
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A function is used when a value is returned to the calling routine, while a subroutine is used when a desired task is needed, but no value is returned.Ĭhapter 5 – Subroutines and Functions Invoking a Subroutine A subroutine is used when a series of steps are required but no value is returned to the routine that called the subroutine. Functions and subroutines operate similarly but have one key difference. Each time you repeat a calculation, you waste space and increase the likelihood of a typographical error and therefore cause your application to execute improperly. This reduces the size of the application and debugging time. By breaking code into functions and subroutines, code can be written once and reused often.
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Programs are made more readable by breaking large amounts of code into smaller, more concise parts. Another way to break up an application is by using either functions or subroutines. These actions are referred to as events and are one way of breaking up code into smaller, more logical units. The code associated with accomplishing each task is separated from the code the accomplishes other tasks.
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Chapter 5 – Subroutines and Functions 5.1 What Are Subroutines and Functions? As your applications grow, you need to break them into separate logical units.