sstream.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 "io_preamble.h"
- void f2()
- {
- ostringstream format_message;
- format_message << "val1: " << 512 << "n"
- << "val2: " << 1024 << "n";
- istringstream input_istring(format_message.str());
- int val1 = 0;
- int val2 = 0;
- input_istring >> val1 >> val2;
- input_istring.clear();
- string dump;
- input_istring >> dump >> val1 >> dump >> val2;
- cout << val1 << " " << val2 << endl;
- }
- int main()
- {
- int val1 = 512, val2 = 1024;
- ostringstream format_message;
- // ok: converts values to a string representation
- format_message << "val1: " << val1 << "n"
- << "val2: " << val2 << "n";
- cout << format_message.str() << endl;
- {
- // str member obtains the string associated with a stringstream
- istringstream input_istring(format_message.str());
- string dump; // place to dump the labels from the formatted message
- // extracts the stored ascii values, converting back to arithmetic types
- input_istring >> dump >> val1 >> dump >> val2;
- cout << val1 << " " << val2 << endl; // prints 512 1024
- }
- f2(); // call f2, which prints val1 and val2 again
- {
- istringstream input_istring; // empty istringstream
- // bind input_istring to string held in format_message
- input_istring.str(format_message.str());
- }
- return 0;
- }
- // Sample code to use getline and istringstream to read a line of text
- // and then process the line a word at at time
- void f3()
- {
- string line, word; // will hold a line and word from input, respectively
- while (getline(cin, line)) { // read a line from the input into line
- // do per-line processing
- istringstream stream(line); // bind to stream to the line we read
- while (stream >> word) { // read a word from line
- // do per-word processing
- }
- }
- }