Parameters - Parameters Dr.DavidGaitros LEARNINGOBJECTIVES...

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  Parameters  Dr. David Gaitros
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LEARNING OBJECTIVES Parameters Call-by-value Call-by-reference Mixed parameter-lists Overloading and Default  Arguments Examples, Rules Testing and Debugging  Functions assert Macro Stubs, Drivers 4-2
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PARAMETERS Two methods of passing arguments  as parameters Call-by-value "copy" of value is passed Changing the copy does not affect the original Safest thing to do and should be the most common Call-by-reference "address of" actual argument is passed Change to the parameter changes to the original More difficult to do and more dangerous 4-3
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CALL-BY-VALUE  PARAMETERS Copy of actual argument  passed Considered "local variable"  inside function If modified, only "local copy"  changes Function has no access to "actual  argument" from caller This is the default method Used in all examples thus far 4-4
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#include <iostream> using namespace std; // Example of call by value // X contains a copy of the original value void Plusit(int x) { x = x+x; } int main(void) { int y=4; Plusit(y); cout << y << endl; // The output will be 4 because // Inside the routine only the local // copy was changed. return 0; } 4-5 C o p y r i g h t © 2 0 1 1 D r . D a v i d G a i t r o s , F l o r i d a S t a t e U n i v e r s i t y .
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CALL-BY-VALUE PITFALL  Common Mistake: Declaring parameter "again"  inside function: double fee(int hoursWorked, int minutesWorked) {
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