124 lines
4.3 KiB
C++
124 lines
4.3 KiB
C++
// fig06_14.cpp
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// Demonstrating C++ standard library class template vector.
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#include <iostream>
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#include <vector>
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#include <stdexcept>
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void outputVector(const std::vector<int>& items); // display the vector
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void inputVector(std::vector<int>& items); // input values into the vector
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int main() {
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std::vector<int> integers1(7); // 7-element vector<int>
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std::vector<int> integers2(10); // 10-element vector<int>
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// print integers1 size and contents
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std::cout << "Size of vector integers1 is " << integers1.size()
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<< "\nvector after initialization:";
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outputVector(integers1);
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// print integers2 size and contents
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std::cout << "\nSize of vector integers2 is " << integers2.size()
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<< "\nvector after initialization:";
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outputVector(integers2);
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// input and print integers1 and integers2
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std::cout << "\nEnter 17 integers:\n";
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//inputVector(integers1);
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//inputVector(integers2);
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std::cout << "\nAfter input, the vectors contain:\n"
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<< "integers1:";
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outputVector(integers1);
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std::cout << "integers2:";
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outputVector(integers2);
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// use inequality (!=) operator with vector objects
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std::cout << "\nEvaluating: integers1 != integers2\n";
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if (integers1 != integers2) {
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std::cout << "integers1 and integers2 are not equal\n";
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}
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// create vector integers3 using integers1 as an
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// initializer; print size and contents
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std::vector integers3{integers1}; // copy constructor
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std::cout << "\nSize of vector integers3 is " << integers3.size()
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<< "\nvector after initialization: ";
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outputVector(integers3);
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// use overloaded assignment (=) operator
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std::cout << "\nAssigning integers2 to integers1:\n";
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integers1 = integers2; // assign integers2 to integers1
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std::cout << "integers1: ";
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outputVector(integers1);
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std::cout << "integers2: ";
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outputVector(integers2);
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// use equality (==) operator with vector objects
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std::cout << "\nEvaluating: integers1 == integers2\n";
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if (integers1 == integers2) {
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std::cout << "integers1 and integers2 are equal\n";
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}
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// use the value at location 5 as an rvalue
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std::cout << "\nintegers1.at(5) is " << integers1.at(5);
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// use integers1.at(5) as an lvalue
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std::cout << "\n\nAssigning 1000 to integers1.at(5)\n";
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integers1.at(5) = 1000;
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std::cout << "integers1: ";
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outputVector(integers1);
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// attempt to use out-of-range index
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try {
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std::cout << "\nAttempt to display integers1.at(15)\n";
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std::cout << integers1.at(15) << '\n'; // ERROR: out of range
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}
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catch (const std::out_of_range& ex) {
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std::cerr << "An exception occurred: " << ex.what() << '\n';
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}
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// changing the size of a vector
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std::cout << "\nCurrent integers3 size is: " << integers3.size();
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integers3.push_back(1000); // add 1000 to the end of the vector
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std::cout << "\nNew integers3 size is: " << integers3.size()
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<< "\nintegers3 now contains: ";
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outputVector(integers3);
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}
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// output vector contents
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void outputVector(const std::vector<int>& items) {
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for (const int& item : items) {
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std::cout << item << " ";
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}
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std::cout << '\n';
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}
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// input vector contents
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void inputVector(std::vector<int>& items) {
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for (int& item : items) {
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std::cin >> item;
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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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