44 lines
2.0 KiB
C++
44 lines
2.0 KiB
C++
// fig13_09.cpp
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// Standard library class map class template.
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#include <iostream>
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#include <fmt/format.h> // C++20: This will be #include <format>
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#include <map> // map class-template definition
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int main() {
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// create a map; duplicate keys are ignored
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std::map<int, double> pairs{{15, 2.7}, {30, 111.11}, {5, 1010.1},
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{10, 22.22}, {25, 33.333}, {5, 77.54}, {20, 9.345}, {15, 99.3}};
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// walk through elements of pairs
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std::cout << "pairs contains:\nKey\tValue\n";
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for (const auto& pair : pairs) {
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std::cout << fmt::format("{}\t{}\n", pair.first, pair.second);
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}
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pairs[25] = 9999.99; // use subscripting to change value for key 25
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pairs[40] = 8765.43; // use subscripting to insert value for key 40
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// walk through elements of pairs
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std::cout << "\nAfter updates, pairs contains:\nKey\tValue\n";
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for (const auto& pair : pairs) {
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std::cout << fmt::format("{}\t{}\n", pair.first, pair.second);
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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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