string_add.cpp
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上传日期:2022-06-29
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书籍源码
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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>
- #include <string>
- using std::string; using std::cout; using std::endl;
- int main()
- {
- string s1("hello, ");
- string s2("worldn");
- string s3 = s1 + s2; // s3 is hello, worldn
- // print what we've got so far
- cout << "s1: " << s1 << " s2: " << s2 << " s3: " << s3 << endl;
- s1 += s2; // equivalent to s1 = s1 + s2
- // print after update to s1
- cout << "s1: " << s1 << " s2: " << s2 << " s3: " << s3 << endl;
- {
- // a better way to ``add'' punctuation
- string s1("hello");
- string s2("world");
- string s3 = s1 + ", " + s2 + "n";
- // print again, now there won't be a newline after printing s2
- cout << "s1: " << s1 << " s2: " << s2 << " s3: " << s3 << endl;
- }
- return 0;
- }