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In C++, the void is optional Many C++ programmers include the void as a means of making it completely clear to anyone reading the program that a function does not have any parameters, but this is technically unnecessary In C++, all functions must be prototyped This is an option in C (although good programming practice suggests full prototyping be used in a C program) A small, but potentially important, difference between C and C++ is that in C, a character constant is automatically elevated to an integer In C++, it is not In C, it is not an error to declare a global variable several times, even though it is bad programming practice In C++, this is an error In C, an identifier will have at least 31 significant characters In C++, all characters are considered significant However, from a practical point of view, extremely long identifiers are unwieldy and are seldom needed In C, although unusual, you can call main( ) from within a program In C++, this is not allowed In C, you cannot take the address of a register variable In C++, you can In C, if no type specifier is present in some types of declaration statements, the type int is assumed This default-to-int rule does not apply to C++ The default-to-int rule has also been dropped from the C99 standard In C++, local variables can be declared anywhere within a block In C, they must be declared at the start of a block, before any action statements occur
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The Standard Template Library and the string Class
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An Overview of the STL
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Although the Standard Template Library is large and its syntax is, at times, rather intimidating, it is actually quite easy to use once you understand how it is constructed and what elements it employs Therefore, before looking at any code examples, an overview of the STL is warranted At the core of the Standard Template Library are three foundational items: containers, algorithms, and iterators These items work in conjunction with one another to provide off-the-shelf solutions to a variety of programming problems
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Containers are objects that hold other objects There are several different types of containers For example, the vector class defines a dynamic array, deque creates a double-ended queue, and list provides a linear list These containers are called
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his chapter explores what is considered by many to be the most important new feature added to C++ in recent years: the Standard Template Library The inclusion of the standard template library, or STL, was one of the major efforts that took place during the standardization of C++ The STL provides general-purpose, templatized classes and functions that implement many popular and commonly used algorithms and data structures For example, it includes support for vectors, lists, queues, and stacks It also defines various routines that access them Because the STL is constructed from template classes, the algorithms and data structures can be applied to nearly any type of data The STL is a complex piece of software engineering that uses some of C++ s most sophisticated features To understand and use the STL, you must have a complete understanding of the C++ language, including pointers, references, and templates Frankly, the template syntax that describes the STL can seem quite intimidating although it looks more complicated than it actually is While there is nothing in this chapter that is any more difficult than the material in the rest of this book, don t be surprised or dismayed if you find the STL confusing at first Just be patient, study the examples, and don t let the unfamiliar syntax override the STL s basic simplicity The purpose of this chapter is to present an overview of the STL, including its design philosophy, organization, and constituents, along with the programming techniques needed to use it Because the STL is a large library, it is not possible to discuss all of its features here This chapter also describes one of C++ s most important classes: string The string class defines a string data type that allows you to work with character strings much as you do with other data types: using operators The string class is closely related to the STL, so it makes sense to discuss both in this chapter
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