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extern/stdcxx/4.2.1/examples/manual/accumulate.cpp

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+/**************************************************************************
+ *
+ * accum.cpp - Example program for accumulate.
+ *
+ * $Id: accumulate.cpp 550991 2007-06-26 23:58:07Z sebor $
+ *
+ ***************************************************************************
+ *
+ * Licensed to the Apache Software  Foundation (ASF) under one or more
+ * contributor  license agreements.  See  the NOTICE  file distributed
+ * with  this  work  for  additional information  regarding  copyright
+ * ownership.   The ASF  licenses this  file to  you under  the Apache
+ * License, Version  2.0 (the  "License"); you may  not use  this file
+ * except in  compliance with the License.   You may obtain  a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the  License is distributed on an  "AS IS" BASIS,
+ * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY  KIND, either  express or
+ * implied.   See  the License  for  the  specific language  governing
+ * permissions and limitations under the License.
+ *
+ * Copyright 1994-2006 Rogue Wave Software.
+ * 
+ **************************************************************************/
+
+#include <numeric>    // for accumulate
+#include <vector>     // for vector
+#include <functional> // for multiplies
+#include <iostream>   // for cout
+
+#include <examples.h>
+
+int main ()
+{
+    // Typedef for convenience.
+    typedef std::vector<int, std::allocator<int> > Vector;
+
+    // Initialize a vector using an array of integers.
+    const Vector::value_type arr[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
+    Vector v1 (arr, arr + sizeof arr / sizeof *arr);
+
+    // Accumulate sums and products.
+    Vector::value_type sum =
+        std::accumulate (v1.begin (), v1.end (), 0);
+
+    Vector::value_type prod =
+        std::accumulate (v1.begin (), v1.end (), 1,
+                         std::multiplies<Vector::value_type>());
+
+    // Output the results.
+    std::cout << "For the series: ";
+    for (Vector::iterator i = v1.begin (); i != v1.end (); ++i)
+        std::cout << *i << " ";
+
+    std::cout << "where N = " << v1.size ()
+              << "\nThe sum = (N * N + N) / 2 = " << sum
+              << "\nThe product = N! = " << prod << std::endl;
+
+    return 0;
+}