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The first statement in the body of main executes an expression In C++ an expression is composed of one or more operands and (usually) an operator The expressions in this statement use the output operator (the << operator) to print the prompt on the standard output:
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std::cout << "Enter two numbers:" << std::endl;
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This statement uses the output operator twice Each instance of the output operator takes two operands: The left-hand operand must be an ostream object; the right-hand operand is a value to print The operator writes its right-hand operand to the ostream that is its left-hand operand In C++ every expression produces a result, which typically is the value generated by applying an operator to its operands In the case of the output operator, the result is the value of its left-hand operand That is, the value returned by an output operation is the output stream
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itself The fact that the operator returns its left-hand operand allows us to chain together output C++ Primer, Fourth Edition requests The statement that prints our prompt is equivalent to
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By Stanley B Lippman,Jos e Lajoie, Barbara E Moo (std::cout << "Enter two numbers:") << std::endl; Publisher:Addison Wesley Professional Pub Date: February 14, 2005 Because(std::cout << "Enter two numbers:") returns its left operand, std::cout, this Print ISBN: 0-201-72148-1 statement is equivalent to Pages: 912
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Table of Contents | Index
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std::cout << "Enter two numbers:"; std::cout << std::endl;
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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 a means to write useful programs without first having to master every language an output stream has the endl is thespecial value, called a manipulator, that when written to detail Highlighting today's best practices, writing a newline to the that are and flushing the buffer associated with that device effect of they show how to write programs outputsafe, can be built quickly, and yet offer outstanding performance Examples that take buffer, of ensure that the the features of C++, also show written to the stream By flushing the advantagewethe library, and explainuser will see the output how to make the best use of the language As in immediatelyits 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 in its coverageThe source code for the book's extended examples is available on Programmers often insert print statements during debugging the Web at the address below
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Such statements should always flush the stream Forgetting to do so may cause output to be left in the buffer if the program crashes, leading to incorrect inferences about where the program crashed
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Using Names from the Standard Library
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Careful readers will note that this program uses std::cout and std::endl rather than just cout and endl The prefix std:: indicates that the names cout and endl are defined inside the namespace named std Namespaces allow programmers to avoid inadvertent collisions with the same names defined by a library Because the names that the standard library defines are defined in a namespace, we can use the same names for our own purposes One side effect of the library's use of a namespace is that when we use a name from the library, we must say explicitly that we want to use the name from the std namespace Writing std::cout uses the scope operator (the :: operator) to say that we want to use the name cout that is defined in the namespace std We'll see in Section 31 (p 78) a way that programs often use to avoid this verbose syntax
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