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+// Fig. 4.19: fig04_19.cpp
+// Linear search of an array.
+#include <iostream>
+
+using std::cout;
+using std::cin;
+using std::endl;
+
+int linearSearch( const int [], int, int );  // prototype
+
+int main()
+{
+   const int arraySize = 100;  // size of array a
+   int a[ arraySize ];         // create array a
+   int searchKey;              // value to locate in a
+
+   for ( int i = 0; i < arraySize; i++ )  // create some data
+      a[ i ] = 2 * i;
+
+   cout << "Enter integer search key: ";
+   cin >> searchKey;
+
+   // attempt to locate searchKey in array a
+   int element = linearSearch( a, searchKey, arraySize );
+
+   // display results
+   if ( element != -1 )
+      cout << "Found value in element " << element << endl;
+   else
+      cout << "Value not found" << endl;
+
+   return 0;  // indicates successful termination
+
+} // end main
+
+// compare key to every element of array until location is 
+// found or until end of array is reached; return subscript of 
+// element if key or -1 if key not found
+int linearSearch( const int array[], int key, int sizeOfArray )
+{
+   for ( int j = 0; j < sizeOfArray; j++ )
+
+      if ( array[ j ] == key )  // if found,
+         return j;              // return location of key
+
+   return -1;  // key not found
+
+} // end function linearSearch
+
+/**************************************************************************
+ * (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.                     *
+ *************************************************************************/