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Table 85 stringstream -Specific Operations
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stringstream strm; stringstream strm(s);
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Creates an unbound stringstream Creates a stringstream that holds a copy of the string s Returns a copy of the string that strm holds Copies the string s into strm Returns void
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strmstr() strmstr(s)
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Using a stringstream
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We've seen programs that need to deal with their input a word at a time or a line at a time The first sort of programs use the string input operator and the second use the getline function However, some programs need to do both: They have some processing to do on a per-line basis and other work that needs to be done on each word within each line Using stringstreams lets us do so:
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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 thelinewe read while (stream >> word){ // read a word from line
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// do per-word processing } }
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C++ Primer, Fourth Edition By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Here we use getline to get an entire line from the input To get the words in each line, we Publisher:Addison Wesley bind an istringstream to the line that we read We can then use the normal string input operator to readProfessional the words from each line Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 Pages: 912
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Table of Contents | Index
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stringstreams Provide Conversions and/or Formatting
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One common use of stringstreams is when we want to obtain automatic formatting across multiple data types For example, we might have a collection of numeric values but want their This popular tutorial introduction vice versa The sstream input and output operations automatically string representation or to standard C++ has been completely updated, reorganized, and rewritten to help programmers arithmetic type into its corresponding string representation or back again: convert an learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last
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edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving readers the means to write useful programs without first having to master every language detail Highlighting today's best int val1 = 512, val2 = 1024; practices, they show how to write programs that are safe, can be built quickly, and yet offer outstanding performance ostringstream format_message; Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the language ok: in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes // As converts values to a string representation it a valuable resource even for more experienced<< val1 << "\n" Faster and More Effectively with This Rewritten format_message << "val1: " programmersProgram Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming << "val2: " << val2 << "\n"; styles and program design techniques Filled with new learning aids that emphasize important points, warn about common pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on the Web at the address empty Here we create an below ostringstream object named format_message and insert the
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indicated text into that object What's important is that the int values are automatically converted to their printable string equivalents The contents of format_message are the characters
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val1: 512\nval2: 1024
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We could retrieve the numeric value by using an istringstream to read from the string Reading an istringstream automatically converts from the character representation of a numeric value to its corresponding arithmetic value:
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// str member obtains the string associated with a stringstream istringstream input_istring(format_messagestr()); 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
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Here we use the str member to obtain a copy of the string associated with the ostringstream we previously created We bind input_istring to that string When we read input_istring , the values are converted back to their original numeric representations
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To read input_string, we must parse the string into its component parts We want the numeric values; to get them we C++ Primer, Fourth Edition must read (and ignore) the labels that are interspersed with the By we want dataStanley B Lippman,Jos e Lajoie,
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Barbara E Moo Publisher:Addison Wesley Professional Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 Because the input operator reads typed values, it is essential that the types of the objects into Pages: 912