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+// FILE: maximal.cxx

+// A demonstration program for a template function called maximal.

+

+#include <cstdlib>   // Provides EXIT_SUCCESS

+#include <iostream>  // Provides cout

+#include <string>    // Provides string class

+using namespace std;

+

+// TEMPLATE FUNCTION used in this demonstration program:

+// Note that some compilers require the entire function definition to appear

+// before its use (rather than a mere prototype). This maximal function is

+// similar to max from <algorithm>.

+template <class Item>

+Item maximal(Item a, Item b)

+// Postcondition: Returns the larger of a and b.

+// Note: Item may be any of the C++ built-in types (int, char, etc.), or a

+// class with the > operator and a copy constructor.

+{

+    if (a > b)

+        return a;

+    else

+        return b;

+}

+

+int main( )

+{

+    string s1("frijoles");

+    string s2("beans");

+

+    cout << "Larger of frijoles and beans: " << maximal(s1, s2) << endl;

+    cout << "Larger of 10 and 20 : " << maximal(10, 20) << endl;

+    cout << "Larger of $ and @ : " << maximal('$', '@') << endl;

+    cout << "It's a large world." << endl;

+

+    return EXIT_SUCCESS;

+}