44 lines
2.0 KiB
C++
44 lines
2.0 KiB
C++
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// fig06_07.cpp
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// Die-rolling program using an array instead of switch.
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#include <format> // C++20: This will be #include <format>
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#include <iostream>
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#include <array>
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#include <random>
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int main() {
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// set up random-number generation
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std::random_device rd; // used to seed the default_random_engine
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std::default_random_engine engine{rd()}; // rd() produces a seed
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std::uniform_int_distribution randomDie{1, 6};
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constexpr size_t arraySize{7}; // ignore element zero
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std::array<int, arraySize> frequency{}; // initialize to 0s
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// roll die 60,000,000 times; use die value as frequency index
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for (int roll{1}; roll <= 60'000'000; ++roll) {
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++frequency.at(randomDie(engine));
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}
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std::cout << std::format("{}{:>13}\n", "Face", "Frequency");
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// output each array element's value
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for (size_t face{1}; face < frequency.size(); ++face) {
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std::cout << std::format("{:>4}{:>13}\n", face, frequency.at(face));
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}
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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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