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