Logical NOT Operator in .NET framework

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Logical NOT Operator
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The logical NOT operator (!) treats its operand as a condition It yields a result that has the opposite truth value from its operand If the operand evaluates as nonzero, then ! returns false For example, we might determine that a vector has elements by applying the logical NOT operator to the value returned by empty:
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// assign value of first element in vec toxif there is one int x = 0; if (!vecempty()) x = *vecbegin();
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The subexpression
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!vecempty()
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evaluates to TRue if the call to empty returns false
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The Relational Operators Do Not Chain Together By Stanley B Lippman,Jos e Lajoie,
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Barbara E Moo
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C++ Primer, Fourth Edition
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The relational operators (<, <=, >, <=) are left associative The fact that they are left associative is rarely of any use because the relational operators return bool results If we do Publisher:Addison Wesley chain these operators together, the result is likely to be surprising: Professional
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Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 // oops! this condition does not determine if the 3 values are unequal Pages: 912
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if (i < j < k) { /* */ }
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Table of Contents | Index
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This popular this introduction to will evaluate been completely greater than one! The reason is As written,tutorial expression standard C++ hasas true if k isupdated, reorganized, and rewritten to help that the programmers learn the second less-than operator is the TRue/false result of the firstthat the last left operand of the language faster and use it in a more modern, effective wayJust as C++ has evolved since is, the edition, so compares k to the to teaching it They now or 1 To C++ standard the from the intended, we conditionhas the authors' approach integer values of 0introduce theaccomplish librarytest we beginning, giving readers the means to expression as follows: must rewrite the write useful programs without first having to master every language detail Highlighting today's best practices, they show how to write programs that are safe, can be built quickly, and yet offer outstanding performance Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the if (i < j && editions, { /* */ } language As in its previous j < k)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 bool learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on the Web at the address below
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Equality Tests and the
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Literals
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As we'll see in Section 5122 (p 180) a bool can be converted to any arithmetic typethe bool valuefalse converts to zero and true converts to one
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Becausebool converts to one, is almost never right to write an equality test that tests against the bool literal TRue:
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if (val == true) { /* */ }
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Either val is itself a bool or it is a type to which a bool can be converted If val is a bool, then this test is equivalent to writing
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if (val) { /* */ }
which is shorter and more direct (although admittedly when first learning the language this kind of abbreviation can be perplexing)
More importantly, if val is not a bool, then comparing val with true is equivalent to writing
C++ Primer, Fourth Edition
if (val == Stanley B Lippman,Jos e Lajoie, By 1) { /* */ }
Barbara E Moo Publisher:Addison Wesley which is very different from Professional Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 // condition succeeds ifval is any nonzero value Pages: 912