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| author | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
|---|---|---|
| committer | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
| commit | 33613a85afc4b1481367fbe92a17ee59c240250b (patch) | |
| tree | 670b842326116b376b505ec2263878912fca97e2 /Bachelor/Prog1/examples/ch03/Fig03_20.cpp | |
| download | Studium-master.tar.gz Studium-master.tar.bz2 | |
Diffstat (limited to 'Bachelor/Prog1/examples/ch03/Fig03_20.cpp')
| -rw-r--r-- | Bachelor/Prog1/examples/ch03/Fig03_20.cpp | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/Bachelor/Prog1/examples/ch03/Fig03_20.cpp b/Bachelor/Prog1/examples/ch03/Fig03_20.cpp new file mode 100644 index 0000000..e94ca30 --- /dev/null +++ b/Bachelor/Prog1/examples/ch03/Fig03_20.cpp @@ -0,0 +1,61 @@ +// Fig. 3.20: fig03_20.cpp
+// Comparing pass-by-value and pass-by-reference
+// with references.
+#include <iostream>
+
+using std::cout;
+using std::endl;
+
+int squareByValue( int ); // function prototype
+void squareByReference( int & ); // function prototype
+
+int main()
+{
+ int x = 2;
+ int z = 4;
+
+ // demonstrate squareByValue
+ cout << "x = " << x << " before squareByValue\n";
+ cout << "Value returned by squareByValue: "
+ << squareByValue( x ) << endl;
+ cout << "x = " << x << " after squareByValue\n" << endl;
+
+ // demonstrate squareByReference
+ cout << "z = " << z << " before squareByReference" << endl;
+ squareByReference( z );
+ cout << "z = " << z << " after squareByReference" << endl;
+
+ return 0; // indicates successful termination
+} // end main
+
+// squareByValue multiplies number by itself, stores the
+// result in number and returns the new value of number
+int squareByValue( int number )
+{
+ return number *= number; // caller's argument not modified
+
+} // end function squareByValue
+
+// squareByReference multiplies numberRef by itself and
+// stores the result in the variable to which numberRef
+// refers in function main
+void squareByReference( int &numberRef )
+{
+ numberRef *= numberRef; // caller's argument modified
+
+} // end function squareByReference
+
+/**************************************************************************
+ * (C) Copyright 1992-2003 by Deitel & Associates, Inc. and Prentice *
+ * Hall. All Rights Reserved. *
+ * *
+ * DISCLAIMER: The authors and publisher of this book have used their *
+ * best efforts in preparing the book. These efforts include the *
+ * development, research, and testing of the theories and programs *
+ * to determine their effectiveness. The authors and publisher make *
+ * no warranty of any kind, expressed or implied, with regard to these *
+ * programs or to the documentation contained in these books. The authors *
+ * and publisher shall not be liable in any event for incidental or *
+ * consequential damages in connection with, or arising out of, the *
+ * furnishing, performance, or use of these programs. *
+ *************************************************************************/
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