ssrs pdf 417 These all work the same way: they return the current value after replacing it with the new value. in Software

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EXAMPLE 12.2 Changing the Fill and Width of tout main0 1 cout.fill('#'); coutwidth(40); tout c-c "Hello, World." -c-c endl'; tout << "Hello, world.' CC endl; >
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Hello, world.
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After changing the fill character and the field width, the next item output is right-justified in a field of 40 columns with the 1# I character padding on the left. Note that both the - fill and -width parameters revert back to their default values ( I 1 and 0) immediately after the next output.
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EXAMPLE 12.3 Changing the Precision of main0
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double pi = 3.14159265358979323846; tout << "pi = ' << pi -CC endl; cout.precision(l6); tout << 'pi = ' c-c pi << endl; tout C-K 'pi = " << pi << endl; cout.precision(20); tout CC "pi = ' << pi C=C endl;
Pi =- 3*14259
pi. 22 3,141592453589793 pi = 3.1415~~Z6535897~3 pi = 3.242592653589793116 -
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The default value for the _prec data member is 6. This means that floats will be displayed using 6 dig- its, as the first output of pi shows. Changing that to 16 causes tout to print 16 digits. That is the maximum number of digits that type double can store (on a 32-bit machine), so increasing it to 20 only results in garbage digits after the 16th. Note that, unlike the -f i 11 and w i d t h parameters, the precision parameter does not revert back to its default value after the next output. 12.3 ios FORMAT FLAGS
The width, precision, and fill parameters for a stream object are implemented with separate data members because each parameter can have more than two values. For example, any letter of the alphabet could be the fill character. But streams have many other attributes which are Boolean; i.e., their value is either true or false. These are the parameters that are listed in the first enum definition above, and are summarized in Table 12.1 below. All 15 of these flags are packed into the single data member - flags. The next example illustrates one way to change a stream s format flags.
EXAMPLE 12.4 Using
tout . flags ( ) to Set a Stream s Format Flags
main0 -t int n = 234; long oldf = cout.flags( ios::hex I ios::uppercase >; tout << n << endl; cout.flags( ios::hex I ios: :showbase >; tout << n CC endl; cout.flags(oldf); tout << n << endl; >
EA (3xea 234
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CHAP. 121
STREAM I/O
The first call to tout . flags ( ) sets the hex and uppercase flags, while saving all the previous settings in oldf. Notice that the hexadecimal form for the integer 234 is ea, which is printed EA because the uppercase flag is set. (See Appendix H for more information on hexadecimal numerals.) The second call to tout. flags () sets the hex and showbase flags, causing all other flags to be cleared, so that the second output prints the hexadecimal letters for n in lowercase and with the leading OX to show that the numeral is hexadecimal. The third call to tout . flags ( ) restores the original .( default) settings. Table 12.1 Format Flags
Flag
ios: :skipws ios: :left ios: :right ios: :internal ios: :dec ios: : act ios: :hex ios: :showbase ios: :showpoint ios:: uppercase ios: :showpos ios: :scientific ios: :fixed ios: :unitbuf ios: :stdio
Effect When Set
Skip leading white space during formatted input. (default) Left-justify output, padding on right to make required width. Right-justify output, padding on left to make required width. (default) Right-justify numeric output, left-justify any sign or radix, and pad the middle to make required width. Input and output integers base 10. (default for output) Input and output integers base 8. Input and output integers base 16. Output integers with radix prefix; e.g., 027 for (act), 0x2~1 for (hex). (default) butput real numbers with decimal point and trailing zeros. Use uppercase letters to output hex integers and reals in scientific. Prefix positive integers with 1 1 + . Output real numbers in scientific notation; e.g., 1.2 3 45 6e- 0 9 Output real numbers with n digits to right of decimal point, where rz is the precision (Jrec) Flush the output stream after each insertion. Flush stdio and stderr after each insertion.
The flags ( > function sets the stream s flags to the new setting without retaining any of the previous settings. So it has the effect of clearing all the flags that are not named in the function s argument. In Example 12.4, the second call to tout . flags ( > cleared the three settings made by the first call. To set one or more flags without clearing any others, use the set f ( ) function, which is one of the three other member functions defined in ios for accessing the format flags:
class ios { public: // previous members included here long setf(long f) { long t = -flags; -flags I= f; return,t; > long setf(long f, long mask) { long t = -flags; - flags = ( - flags & -mask) 1 (f & mask); return t; > long unsetf(long mask) { long t = _ flags & mask; - flags SC= -mask; return t;. } // more members included here
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