Function Declarations Go in Header Files in .NET

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Recall that variables are declared in header files (Section 29, p 67) and defined in source files For the same reasons, functions should be declared in header files and defined in source files It may be temptingand would be legalto put a function declaration directly in each source file that uses the function The problem with this approach is that it is tedious and error-prone By putting function declarations into header files, we can ensure that all the declarations for a given function agree If the interface to the function changes, only one declaration must be changed
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The source file that defines the function should include the header that declares the function
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Including the header that contains a function's declaration in the same file that defines the function lets the compiler check that the definition and declaration are the same In particular, if the definition and declaration agree as to parameter list but differ as to return type, the compiler will issue a warning C++error message indicating the discrepancy or Primer, Fourth Edition
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By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley Professional Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 Pages: 912
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Exercises Section 74
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Table of Contents | Index
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Exercise 722:
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Write the prototypes for each of the following functions:
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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 named compare effective wayJust as C++ has evolved since the last a A function it in a more modern, with two parameters that are references to edition, so has the authors' approach to teaching it They now introduce the C++ standard libraryof type beginning, giving a class named matrix and with a return value from the bool readers the means to 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 a vector<int> iterator and b A function named change_val that returns outstanding performance Examples that take advantage of the library, and explain the features ofis analso show how to other is best use of the for a takes two parameters: one C++, int and the make the an iterator language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes vector<int> it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten Classic Restructured for quicker learning, using the C++ these prototypes, use thethe most of theprogramming Hint: When you write standard library Updated to teach name current function as an styles and program design indicator Filled with new learning aids thatdoes How does this hint affectcommon techniques as to what the function emphasize important points, warn about the types pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills you use learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on the Web atExercise below the address Given the following declarations, determine which calls are legal and which
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723:
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are illegal For those that are illegal, explain why
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double calc(double); int count(const string &, char); int sum(vector<int>::iterator, vector<int>::iterator, int); vector<int> vec(10); (a) (b) (c) (d) calc(234, 551); count("abcda", 'a'); calc(66); sum(vecbegin(), vecend(), 38);
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741 Default Arguments
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A default argument is a value that, although not universally applicable, is the argument value that is expected to be used most of the time When we call the function, we may omit any argument that has a default The compiler will supply the default value for any argument we omit A default argument is specified by providing an explicit initializer for the parameter in the parameter list We may define defaults for one or more parameters However, if a parameter has a default argument, all the parameters that follow it must also have default arguments For example, a function to create and initialize a string intended to simulate a window can provide default arguments for the height, width, and background character of the screen:
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string screenInit(string::size_type height = 24, string::size_type width = 80, C++ Primer, Fourth Edition char background = ' ' );
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By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley A function that provides a default argument for a parameter can be invoked with or without an Professional argument for this parameter If an argument is provided, it overrides the default argument value; Pub Date: February used Each of the following calls of screenInit is correct: otherwise, the default argument is14, 2005 Print ISBN: 0-201-72148-1 Pages: 912
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