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The following diagram shows the relationships between streams and the things that they manage. As a manager of a data source or destination, we can imagine a stream as a pipe through which the data flows to or from the executing program:
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main0 { tout -C-C "Hello, World!\n"; :
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This shows 3 input streams and 3 output streams, each represented by a gray box. For example, inbuf is an input stream of type is trs tream which manages the input of data from a C-string into the program, and cow is an output stream of type os tream which manages the output of data from the program to the display screen.
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C++ uses streams to manage data flow, including flow to and from external files. A file is a sequence of bits stored on some external device such as a disk or magnetic tape. The bits are interpreted according to the protocol of some software system. If the bits are grouped into &bit bytes interpreted by the ASCII code, then the file is called a text file and can be processed by standard editors. If the bits are grouped into 32-bit words representing color pixels, then the file is a graphics jile and is processed by specialized graphics software. If the file is an executable program, then its bits are interpreted as instructions to the computer s processor.
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In C++, a file is simply an external stream: a sequence of bytes stored on disk. If the file is open for output, then it is an output file stream. If the file is open for input, then it is an input file stream. The < fs tream> header defines the class o fs tream of output file streams and the class i f s tream of input file streams. Instances of these classes behave like other internal streams: the insertion and extraction operators apply the same way.
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Example 14.4 shows how to write data to an external file. This requires instantiating the ofs tream class which is defined in the < f s tream> header. Analogously, Example 14.4 shows . how to read data from external file.
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EXAMPLE 14.7 Writing to an External Data File
The < f s t ream. h> header file defines the of s t ream class which must be instantiated to write to an external file:
#include #include #include <iostream.h> <fstream.h> <stdlib.h> // defines tout stream // defines ofstream class // defines exit0 function
main0 1 ofstream outfile("grades.dat", ios::out); if (!outfile) { cerr c-c "Error: output file could not be opened.\n"; exit(l);
char id[9], name[16]; int grade; tout << "\tl: H; int n = 1; while (tin >> id >> name >> grade) { outfile << name << 'I 'I -c-c id << 'I 'I tout c-c "\t" -cc ++n c-c 'I: 'I;
x-c grade CC endl;
outfile.close();
A&azns
2 0 9 1 3 4 6 6 2 83
2: 3: 4: 5: 6:
J3akar Dads Evtns w:
Cohen 310051782
55281882977 89' 846112103 85 6526336670 92
The first line invokes the of s tream constructor which opens file grades . dat as an output file, constructs the stream out file, and attaches that stream to the file. The second line invokes the overloaded negation operator ! to ensure that the file is opened properly. If not, an error message is printed and the program is terminated. Otherwise, the program uses an input loop to read names, identification numbers, and grades from the standard input and writes them to the external file. The resulting external file looks like this:
grades.dat 209134662 Adams 83 552818829 Baker 77 310051782 Cohen 89 446112103 Davis 85 616336670 Evans 92 !
EXAMPLE 14.8 Reading from an External Data File
The <fstream.h> from an external file:
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