52 lines
2.3 KiB
C++
52 lines
2.3 KiB
C++
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// fig05_08.cpp
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// Passing arguments by value and by reference.
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#include <iostream>
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using namespace std;
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int squareByValue(int number); // prototype (for value pass)
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void squareByReference(int& numberRef); // prototype (for reference pass)
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int main() {
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int x{2}; // value to square using squareByValue
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int z{4}; // value to square using squareByReference
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// demonstrate squareByValue
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cout << "x = " << x << " before squareByValue\n";
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cout << "Value returned by squareByValue: "
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<< squareByValue(x) << endl;
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cout << "x = " << x << " after squareByValue\n\n";
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// demonstrate squareByReference
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cout << "z = " << z << " before squareByReference\n";
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squareByReference(z);
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cout << "z = " << z << " after squareByReference\n";
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}
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// squareByValue multiplies number by itself, stores the
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// result in number and returns the new value of number
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int squareByValue(int number) {
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return number *= number; // caller's argument not modified
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}
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// squareByReference multiplies numberRef by itself and stores the result
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// in the variable to which numberRef refers in function main
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void squareByReference(int& numberRef) {
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numberRef *= numberRef; // caller's argument modified
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}
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/**************************************************************************
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* (C) Copyright 1992-2022 by Deitel & Associates, Inc. and *
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* Pearson Education, Inc. All Rights Reserved. *
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* *
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* DISCLAIMER: The authors and publisher of this book have used their *
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* best efforts in preparing the book. These efforts include the *
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* development, research, and testing of the theories and programs *
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* to determine their effectiveness. The authors and publisher make *
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* no warranty of any kind, expressed or implied, with regard to these *
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* programs or to the documentation contained in these books. The authors *
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* and publisher shall not be liable in any event for incidental or *
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* consequential damages in connection with, or arising out of, the *
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* furnishing, performance, or use of these programs. *
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**************************************************************************/
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