find_ops.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 <string>
- #include <iostream>
- using std::string; using std::cout; using std::endl;
- int main()
- {
- string numerics("0123456789");
- string name("r2d2");
- string::size_type pos = name.find_first_of(numerics);
- cout << "found number at index: " << pos
- << " element is " << name[pos] << endl;
- {
- string::size_type pos = 0;
- // each trip reset pos to the next instance in name
- while ((pos = name.find_first_of(numerics, pos))
- != string::npos) {
- cout << "found number at index: " << pos
- << " element is " << name[pos] << endl;
- ++pos; // move to the next character
- }
- }
- string river("Mississippi");
- string::size_type first_pos = river.find("is"); // returns 1
- string::size_type last_pos = river.rfind("is"); // returns 4
- cout << "find returned: " << first_pos
- << " rfind returned: " << last_pos << endl;
- {
- string numbers("0123456789");
- string dept("03714p3");
- // returns 5, which is the index to the character 'p'
- string::size_type pos = dept.find_first_not_of(numbers);
- cout << "first_not returned: " << pos << endl;
- }
- return 0;
- }