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C Versus C++ I/O
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Because C forms the foundation for C++, there is sometimes confusion over how C s I/O system relates to C++ First, C++ supports the entire set of C I/O functions Thus, if you will be porting C code to C++, you will not have to change all of the I/O routines right away Second, C++ defines its own, object-oriented I/O system, which includes both I/O functions and I/O operators and completely duplicates the functionality of the C I/O system If you are writing C++ programs, you should use the C++ I/O system (described in Part Three) For C code, you must use the standard C I/O system described in this chapter However, even if you will be writing mostly C++ code, you will still want to be familiar with the C I/O system for these three reasons: I For several years to come, C and C++ will coexist Also, many programs will be hybrids of both C and C++ code Further, many C programs will be upgraded into C++ programs Thus, knowledge of both the C and the C++ I/O systems is necessary For example, in order to change the C-based I/O functions into C++ object-oriented I/O functions, you will need to know how both the C and C++ I/O systems operate I An understanding of the basic principles behind the C I/O system helps you understand the C++ object-oriented I/O system (Both share the same general concepts)
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Input, Output, Streams, and Files
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I In certain situations (for example, in very short, throw-away programs), it may be easier to use C s non-object-oriented approach to I/O than it is to use the object-oriented I/O defined by C++ In addition, there is an unwritten rule that any C++ programmer must also be a C programmer If you don t know how to use the C I/O system, you will be limiting your professional horizons
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THE FOUNDATION OF C++
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Fundamental to understanding the C (and C++) I/O system are the concepts of streams and files The C I/O system supplies a consistent interface to the programmer independent of the actual device being accessed That is, the C I/O system provides a level of abstraction between the programmer and the hardware This abstraction is called a stream; the actual device is called a file It is important to know how streams and files interact
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The C I/O system is designed to work with a wide variety of devices, including terminals, disk drives, and tape drives Even though each device is different, the I/O system transforms each into a logical device called a stream All streams behave similarly Because streams are largely device independent, the same function that can write to a disk file can also write to another type of device, such as the console There are two types of streams: text and binary
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Text Streams
A text stream is a sequence of characters Standard C states that a text stream is organized into lines terminated by a newline character However, the newline character is optional on the last line In a text stream, certain character translations may occur as required by the host environment For example, a newline may be converted to a carriage return/linefeed pair Therefore, there may not be a one-to-one relationship between the characters that are written or read and those on the external device Also, because of possible translations, the number of characters written or read may not be the same as the number that is stored on the external device
Binary Streams
A binary stream is a sequence of bytes that have a one-to-one correspondence to those on the external device That is, no character translations occur Also, the number of bytes written or read is the same as the number on the external device However, an implementation-defined number of null bytes may be appended to a binary stream These null bytes might be used to pad the information so that it fills a sector on a disk, for example
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