48 lines
2.0 KiB
C++
48 lines
2.0 KiB
C++
// fig06_12.cpp
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// Compute the product of an array's elements using accumulate.
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#include <array>
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#include <iostream>
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#include <numeric>
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template <typename T>
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T multiply(T x, T y) {
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return x * y;
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}
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int multiply_int(int x, int y) {
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return x * y;
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}
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int main() {
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constexpr std::array integers{1, 2, 3, 4, 5};
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constexpr std::array floats {1.0, 2.0, 3.0, 4.0, 5.0};
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auto multiply_lambda = [](const auto& x, const auto& y) {return x * y; };
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std::cout << "Product of integers: " << std::accumulate( std::begin(integers), std::end(integers), 1, multiply<int>) << "\n";
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std::cout << "Product of integers with a lambda: " << std::accumulate(std::begin(integers), std::end(integers), 1, multiply_lambda) << "\n";
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std::cout << "Product of integers with a lambda: " << std::accumulate(std::begin(floats), std::end(floats), 1, multiply_int) << "\n";
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std::cout << "Product of integers with a lambda: " << std::accumulate(std::begin(floats), std::end(floats), 1, multiply_lambda) << "\n";
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}
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/**************************************************************************
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* (C) Copyright 1992-2022 by Deitel & Associates, Inc. and *
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* Pearson Education, Inc. All Rights Reserved. *
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* *
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* DISCLAIMER: The authors and publisher of this book have used their *
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* best efforts in preparing the book. These efforts include the *
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* development, research, and testing of the theories and programs *
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* to determine their effectiveness. The authors and publisher make *
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* no warranty of any kind, expressed or implied, with regard to these *
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* programs or to the documentation contained in these books. The authors *
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* and publisher shall not be liable in any event for incidental or *
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* consequential damages in connection with, or arising out of, the *
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* furnishing, performance, or use of these programs. *
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**************************************************************************/
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