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Display floating-point in decimal notation Display floating-point in scientific notation Flush ostream buffer Insert null, then flush ostream buffer Insert newline, then flush ostream buffer Flush buffers after every output operation Restore normal buffer flushing Skip whitespace with input operators Do not skip whitespace with input operators "Eat" whitespace
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xindicates default stream state
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The following program illustrates the different ways we can control the precision use when printing floating point values:
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// coutprecision reports current precision value cout << "Precision: " << coutprecision() << ", Value: " << sqrt(20) << endl; // coutprecision(12) asks that 12 digits of precision to be printed
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coutprecision(12); cout << "Precision: " << coutprecision() << ", Value: " << sqrt(20) << endl; C++ Primer, precision using // alternative way to setFourth Edition setprecision manipulator By Stanley B Lippman,Jos e Lajoie, cout << setprecision(3); Barbara E Moo cout << "Precision: " << coutprecision() << ", Value: " << sqrt(20) << endl;
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Publisher:Addison Wesley Professional Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 When compiled and executed, the program generates the following output: Pages: 912
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Table of Contents | Index
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Precision: 6, Value: 141421 Precision: 12, Value: 141421356237 Precision: 3, Value: 141
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last 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 This program calls the library sqrt function, which is found in the cmath header The sqrt practices, they show how to write programs that are safe, can be built quickly, and yet offer outstanding performance function is overloaded and can be called on either a float, double , or long double argument Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the It returns the square root of its argument language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming 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 manipulators and other for the book's extended examples is available on Thesetprecision in its coverageThe source code manipulators that take the Web at the address below are defined in the iomanip header arguments
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Controlling the Notation
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By default, the notation used to print floating-point values depends on the size of the number: If the number is either very large or very small, it will be printed in scientific notation; otherwise, fixed decimal is used The library chooses the notation that makes the number easiest to read
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When printing a floating-point number as a plain number (as opposed to printing money, or a percentage, where we want to control the appearance of the value), it is usually best to let the library choose the notation to use The one time to force either scientific or fixed decimal is when printing a table in which the decimal points should line up
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If we want to force either scientific or fixed notation, we can do so by using the appropriate
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manipulator: The scientific manipulator changes the stream to use scientific notation As with printing the x on hexadecimal integral values, we can also control the case of the e in scientific mode through the uppercase manipulator The fixed manipulator changes the C++ decimal stream to use fixed Primer, Fourth Edition
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By Stanley B Lippman,Jos e Lajoie, Barbara E Moo These manipulators change the default meaning of the precision for the stream After executing either scientific or fixed, the precision value controls the number of digits after Publisher:Addison Wesley the decimal point By default, precision specifies the total number of digitsboth before and Professional after the decimal point Using fixed or scientific lets us print numbers lined up in columns Pub Date: February 14, 2005 This strategy ensures that the decimal point is always in a fixed position relative to the Print printed fractional part being ISBN: 0-201-72148-1 Pages: 912
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