ssrs pdf 417 STREAM I/O in Software

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STREAM I/O
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The - flags member is a 32-bit string, so it can hold 32 boolean flags . Only about half of these are used by ios. Those values are given symbolic names by an enum declaration:
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class ios { public: enum { = skipws = left = right internal = = dec = act = hex = showbase show-point = uppercase = = showpos scientific = fixed = unitbuf = stdio = >; // other members
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01, 02, 04, 010, 020, 040, 0100, 0200, 0400, 01000, 02000, 04000, 010000, 020000, 040000
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values for format flag: skip white space left justified in field right justified in field (default) left and right justified use number base 10 for integers use number base 8 for integers use number base 16 for integers show number base for integers print trailing zeros for floats use 'E.', 'x' instead of 'e', 'x' use I+' with positive integers use scientific notation for floats use fixed point notation for floats flush after each output operation flush after each character output
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Each of these 15 constant values is a power of 2, and is represented in octal form. By adding these values for the flags that are set, we obtain the complete flag setting for the stream object in a single octal number. For example, the x object shown above has the octal value o 3 2 4 o for its _ format data member. This octal number decomposes as
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03240 = 02000 + 01000 + 0200 + 040 which indicates that four flags are set: the showpos flag (0 2 o o 0) signaling that the + sign is to be included for positive integers; the uppercase flag (0 IO o 0) signaling that the IE I and Ix 1 characters are to be used instead of the Ie I and 1 I characters when displaying numbers like x 2.308~12 and 0x1204; the showbase flag (0200) signaling that the number base is to be
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displayed for positive integers, and the oc t flag (0 4 0) signaling that integers will be input and output in octal. A stream s data members are all protected, SO the ios class provides a set of access functions for them. All seven of the data members have access functions that return their values:
class ios { public: // more members included here streambuf* rdbuf() const { return -strbuf; ostream* tie0 const { return -tie; } int width0 const { return -width; } int precision0 const { return _prec; } char fill0 const { return - fill; } long flags0 const { return -flags; } int rdstate() const { return -state; } // more members included here 1;
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STREAM I/O
EXAMPLE 12.1 Testing Some of the ios Access Functions main0 1 tout tout tout tout tout
-c-c << << << <<
"cout.width() "cout.precision() "cout.fill() Yin.flags() "cout.flags() 0 6 [ 1 200UU000QU~ 2UO~OOOO~4~
= = =
" " [ ' "
<< cout.width() C< endl; x-c cout.precision() x-c endl; " << cout.fill() -c< "1" xc endl; -cc act -cc cin.flags() << endl; << act << cout.flags() << endl;
cout.width() = 'xx&precision{) = couLfilf~) = tin. flags ( ) = cout.f lags0 =
1 ' ', 'I
This shows that for tout, the default field width is 0, the default precision for floats is 6 digits, and the default fill character is the blank 1 1. The octal value 2 0 0 0 0 0 0 0 0 0 1 means that only the skipws flag (0 1) is set for tin, which means that white space (blank, tab, newline, formfeed, and return) is skipped by default. (The digit 2 in this octal value is irrelevant.) The octal value 2 0 0 0 0 0 0 0 0 4 1 means that the skipws flag (0 1) and the act flag (040) are set for tout. The act flag was set by inserting the oc t manipulator prior to the tout . flags ( ) call.
Each of the four data members -width, _prec, -fill, and -flags also has an access function that can change its value:
class ios { public: int width(int w) { int t = -width; -width = w; return t; } int precision(int p){ int t = Jrec; _-Prec = p; return t; } char fill(char c) { char t = -fill; -fill = c; return t; } long flags(long f) { long t = -flags; -flags = f; return t; } // more members included here
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