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file:///F|/WinDDK/resources/CPPPrimer/c++primerhtm
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cout cout cout cout }
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"ival: " ival " oct set: " oct ival "\n"; "dval: " dval " hex set: " hex dval "\n"; "ival: " ival " dec set: " dec ival "\n"; noshowbase;
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Here is the revised output:
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ival: 16 oct set: 020 dval: 16 hex set: 16 ival: 0x10 dec set: 16
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The noshowbase manipulator resets cout not to display the notational base of the integral values By default, a floating point value has a precision value of 6 This value may be modified by using either the precision(int) member function or the setprecision() stream manipulator (to use the latter, the iomanip header file must be included) precision() returns the current precision value For example:
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#include <iostream> #include <iomanip> #include <mathh> int main() { cout "Precision: " coutprecision() endl sqrt(20) endl; coutprecision(12); cout "\nPrecision: " coutprecision() endl sqrt(20) endl; cout "\nPrecision: " setprecision(3) coutprecision() endl sqrt(20) endl; return 0; }
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When compiled and executed, the program generates the following output:
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Precision: 6 141421 Precision: 12 141421356237 Precision: 3 141
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file:///F|/WinDDK/resources/CPPPrimer/c++primerhtm (1003 / 1065) [2001-3-29 11:32:15]
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Manipulators that take an argument, such as setprecision() and setw() that we looked at earlier, require that we include the iomanip header file:
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#include <iomanip>
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Our example does not illustrate two further aspects of setprecision(): (1) integral values are unaffected and (2) floating point values are rounded, not truncated Thus, 314159 becomes 3142 with precision set to 4, and 314 with precision set to 3 By default, the decimal point is not displayed when the fractional part of the value is 0 For example,
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cout 1000
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To force the display of the decimal point, we use the showpoint manipulator:
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cout showpoint 100 noshowpoint '\n';
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The noshowpoint manipulator reinstates the default behavior Again, by default, floating point values are displayed in fixed decimal notation To change the display to scientific notation, we use the scientific manipulator To change it back to fixed decimal, we use the fixed manipulator:
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cout
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"scientific: " scientific 100 "fixed decimal: " fixed 100 '\n';
This generates
scientific: 10e+01 fixed decimal: 10
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file:///F|/WinDDK/resources/CPPPrimer/c++primerhtm
If we should wish to have the "e" of the scientific notation output display as "E", we use the uppercase manipulator To revert back to lowercase, we use the nouppercase manipulator (The uppercase manipulator does not cause all alpha characters to be displayed in uppercase!) By default, the overloaded input operators skip white space (blank, tab, newline, formfeed, and carriage return) Given the sequence
a b d
the loop
char ch; while ( cin >> ch ) //
executes four times to read the characters a through d, skipping the intervening blanks, possible tabs, and newline characters The manipulator noskipws causes the input operator not to skip white space:
char ch; cin >> noskipws; while ( cin >> ch ) // cin >> skipws;
The while loop now requires seven iterations to read the characters a through d To return to the default behavior, the skipws manipulator is applied to cin When we write
cout "please enter a value: ";
the literal string is stored in a buffer associated with cout There are a number of conditions that cause the buffer to be flushed that is, emptied in our example by writing it to standard output: 1 The buffer can become full In this case, it must be flushed to read the next value 2 We can flush the buffer explicitly using either the flush, ends, or endl manipulator:
// flushes the buffer cout "hi!" flush; // inserts a null then flushes the buffer
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file:///F|/WinDDK/resources/CPPPrimer/c++primerhtm
char ch[2]; ch[0] = 'a'; ch[1] = 'b'; cout ch ends; // inserts a newline then flushes the buffer cout "hi!" endl;
3 unitbuf, an internal stream state variable, can be set to empty the buffer after each output operation 4 The ostream object can be tied to an istream, in which case the ostream buffer is flushed whenever the istream reads from the input stream cout is predefined to be tied to cin:
cintie( &cout );