From 33613a85afc4b1481367fbe92a17ee59c240250b Mon Sep 17 00:00:00 2001
From: Sven Eisenhauer <sven@sven-eisenhauer.net>
Date: Fri, 10 Nov 2023 15:11:48 +0100
Subject: add new repo

---
 Bachelor/Prog1/examples/ch03/Fig03_20.cpp | 61 +++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 Bachelor/Prog1/examples/ch03/Fig03_20.cpp

(limited to 'Bachelor/Prog1/examples/ch03/Fig03_20.cpp')

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.                     *
+ *************************************************************************/
-- 
cgit v1.2.3