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STREAM I/O
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[CHAP. 12
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EXAMPLE 12.26 A Home-Grown Stream Manipulator ostream& beep(ostream& ostr) 1 . return ostr c-c "\a";
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main0 { tout -CC beep;
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When used as shown here, the stream manipulator sends the alert character I \a I to the output stream, which sounds the system beep.
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All stream manipulators work this way. They are defined with prototypes like this:
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ios& f(ios& ostr) ostream& f(ostream& istream& f(ostream& ostr) istr)
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or, in the case of manipulators with parameters, like this:
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ios& f(ios& ostr, int n) ostream& f(ostream& ostr, int n) istream& f(ostream& istr, int n)
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Table 12.3 lists of some of the more common stream manipulators: Table 12.3 Stream Manipulators
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Manipulator
binary dec end1 ends flush hex act resetiosflags(long setbase(int setfill(int n) ch) u) n) u)
Stream
ios ios ostream ostream ostream ios ios ios ostream ostream ios
Action
Set stream mode to binary Read or write integers base 10 (default) End output line and flush output stream End output string Flush output stream Read or write integers base 16 (i.e., in hexadecimal) Read or write integers base 8 (i.e., in octal) Clear format flags specified by u Write integers base n (default: 10) Set fill character to ch (default: 1 I ) Set format flags specified by u Set floating-point precision to n digits (default: 6) Set field width to n columns (default: 0) Set stream to text. (default) Skip white space
setiosflags(long setprecision(int
ios ios
ios istream
setw(int
text ws
We have already seen how the end1 manipulator works. It inserts the newline character I \n f into the output stream and then calls the flush manipulator which flushes the buffer.
CHAP. 121
STREAM II0
The ends manipulator simply inserts the null character 1\ o I into the output stream. This is illustrated in the next example.
EXAMPLE 12.27 Using the ends Stream Manipulator to Terminate a String
main0 { char buffer[] = " "; tin >> ws; cin.read(buffer, 8); tout << " [I' << buffer -CC ll]\n";
The input begins with several newlines, tabs, and blanks. These are all skipped before the 8 characters ABC DE" are into buf f er. Note that only the initial white space is eaten.
The act, dec, hex, and setbase (n) manipulators are used to change the number base of integers that are input or output.
EXAMPLE 12.28 Using the act, dec, and hex Stream Manipulators
main0 { int n = 510; tout -c-c " \tHexadecimal:\t 'I -C-C hex -CC n cc "\n\t Decimal:\t n << dec -cc n << "\n\t Octal:\t I cc act -c-c n tout << "Enter integer in octal: "; tin >> act >> n; // read integer tout -c< " \tHexadecimal:\t I' -CC hex X-C n -c-c "\n\t Decimal:\t n -c< dec -c-c n -cc "\n\t Octal:\t I -cc act -CC n tout << "Enter integer in hexadecimal: "; // read integer tin >> hex >> n; \tHexadecimal:\t I' << hex << n tout -c-c " c-c "\n\t Decimal:\t n c-c dec << n -c-c "\n\t Octal:\t n xc act -cc n
K-c n << " \t << -cc H -c-c n -CC endl;
II \t 11 << n II \t
base 8 C-C "\t ' -C-C n -cc "\t )1 -cc n << I \t I1 c< n -cc endl; base 16 << "\t 'I << n c-c "\t 1 cc n -c-c ll\t' u cc n cc endl;
STREAMIIO
Here is the output:
[CHAP.12
Printing each number twice shows that the manipulator resets the number base for all subsequent input or output until another manipulator is used.
manipulator simply eats the next string of white space (blanks, tabs, newlines).
EXAMPLE 12.29 Using the ws Stream Manipulator to Eat white space main0 { char buffer[] = tin >> ws; cin.read(buffer, 8); tout -c-c " [ " -C-C buffer -C-C >
I
"]\n";
ABC \, . DEF DE ]
The input begins with several newlines, tabs, and blanks. These are all skipped before the 8 characters ABC DE" are into buf f er. Note that only the initial white space is eaten.
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