Borland C++ Builder: The Complete Reference in Java

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Borland C++ Builder: The Complete Reference
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Like inserters, extractor functions cannot be members of the class they are designed to operate upon As shown in the example, they can be friends, or simply independent functions Except for the fact that you must return a reference to an object of type istream, you can do anything you like inside an extractor function However, for the sake of structure and clarity, it is best to limit the actions of an extractor to the input operation
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As you know, using printf( ) you can control the format of information displayed on the screen For example, you can specify field widths and left- or right-justification You can also accomplish the same type of formatting using C++ s approach to I/O There are two ways to format output The first uses member functions of the ios class The second uses a special type of function called a manipulator We will begin by looking at formatting using the member functions of ios
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Formatting Using the ios Member Functions
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Each stream has associated with it a set of format flags that control the way information is formatted The ios class declares a bitmask enumeration called fmtflags in which the following values are defined (Technically, these values are defined within ios_base, which, as explained earlier, is a base class for ios) adjustfield fixed left showbase unitbuf basefield floatfield oct showpoint uppercase boolalpha hex right showpos dec internal scientific skipws
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The values defined by this enumeration are used to set or clear flags that control some of the ways information is formatted by a stream The following describes each flag When the skipws flag is set, leading white-space characters (spaces, tabs, and newlines) are discarded when performing input on a stream When skipws is cleared, white-space characters are not discarded When the left flag is set, output is left justified When right is set, output is right justified When the internal flag is set, a numeric value is padded to fill a field by inserting spaces between any sign or base character If none of these flags is set, output is right justified by default By default, numeric values are output in decimal However, it is possible to change the number base Setting the oct flag causes output to be displayed in octal Setting the hex flag causes output to be displayed in hexadecimal To return output to decimal, set the dec flag
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The C++ I/O Class Library
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Setting showbase causes the base of numeric values to be shown For example, if the conversion base is hexadecimal, the value 1F will be displayed as 0x1F By default, when scientific notation is displayed, the e is in lowercase Also, when a hexadecimal value is displayed, the x is in lowercase When uppercase is set, these characters are displayed in uppercase Setting showpos causes a leading plus sign to be displayed before positive values Setting showpoint causes a decimal point and trailing zeros to be displayed for all floating-point output whether needed or not By setting the scientific flag, floating-point numeric values are displayed using scientific notation When fixed is set, floating-point values are displayed using normal notation When neither flag is set, the compiler chooses an appropriate method When unitbuf is set, the buffer is flushed after each insertion operation When boolalpha is set, Booleans can be input or output using the keywords true and false Since it is common to refer to the oct, dec, and hex fields, they can be collectively referred to as basefield Similarly, the left, right, and internal fields can be referred to as adjustfield Finally, the scientific and fixed fields can be referenced as floatfield To set a flag, use the setf( ) function, whose most common form is shown here: fmtflags setf(fmtflags flags);
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This function returns the stream s previous format flag settings and turns on those flags specified by flags All other flags are unaffected For example, to turn on the showbase flag, you can use the following statement
streamsetf(ios::showbase);
Here, stream can be any stream you want to affect The following program turns on both the showpos and scientific flags for cout:
#include <iostream> using namespace std; int main() { coutsetf(ios::showpos); coutsetf(ios::scientific); cout << 123 << " " << 12323 << " "; return 0; }
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