swap.cpp
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上传日期:2022-06-29
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Visual C++
- /*
- * This file contains code from "C++ Primer, Fourth Edition", by Stanley B.
- * Lippman, Jose Lajoie, and Barbara E. Moo, and is covered under the
- * copyright and warranty notices given in that book:
- *
- * "Copyright (c) 2005 by Objectwrite, Inc., Jose Lajoie, and Barbara E. Moo."
- *
- *
- * "The authors and publisher have taken care in the preparation of this book,
- * but make no expressed or implied warranty of any kind and assume no
- * responsibility for errors or omissions. No liability is assumed for
- * incidental or consequential damages in connection with or arising out of the
- * use of the information or programs contained herein."
- *
- * Permission is granted for this code to be used for educational purposes in
- * association with the book, given proper citation if and when posted or
- * reproduced.Any commercial use of this code requires the explicit written
- * permission of the publisher, Addison-Wesley Professional, a division of
- * Pearson Education, Inc. Send your request for permission, stating clearly
- * what code you would like to use, and in what specific way, to the following
- * address:
- *
- * Pearson Education, Inc.
- * Rights and Contracts Department
- * 75 Arlington Street, Suite 300
- * Boston, MA 02216
- * Fax: (617) 848-7047
- */
- #include <iostream>
- using std::cout; using std::endl; using std::cin;
- #include <string>
- using std::string;
- template <class T> T min(T a, T b)
- {
- return a < b ? a : b;
- }
- // swap parameter values
- template <typename T>
- inline
- void swap(T& val1, T& val2)
- {
- T tmp = val1;
- val1 = val2;
- val2 = tmp;
- }
- int main()
- {
- string s1("hello"), s2("world"), s3("hiya");
- cout << s1 << " " << s2 << endl; // print hello world
- swap(s1, s3);
- cout << s1 << " " << s2 << endl; // print hiya world
- double d1 = 3.14, d2 = 2.7, d3 = 1.4;
- cout << d1 << " " << d2 << endl; // print 3.14 2.7
- swap(d3, d2);
- cout << d1 << " " << d3 << endl; // print 3.14 2.7
- {
- short s1, s2;
- int i1, i2;
- cin >> s1 >> s2;
- cin >> i1 >> i2;
- min(i1, i2); // ok: instantiate min(int, int)
- min(s1, s2); // ok: instantiate min(short, short)
- // now print the results
- cout << min(i1, i2) << endl;
- cout << min(s1, s2) << endl;
- }
- return 0;
- }