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Turns on boolalpha flag Turns on dec flag Output a newline character and flush the stream Output a null Turns on fixed flag Flush a stream Turns on hex flag Turns on internal flag Turns on left flag Turns off boolalpha flag Turns off showbase flag Turns off showpoint flag Turns off showpos flag Turns off skipws flag Turns off unitbuf flag Turns off uppercase flag Turns on oct flag Turn off the flags specified in f Turns on right flag Turns on scientific flag Set the number base to base Set the fill character to ch
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The C++ I/O Manipulators
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setiosflags(fmtflags f) setprecision(int p) setw(int w) showbase showpoint showpos skipws unitbuf uppercase ws Table 24-1
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Turn on the flags specified in f Set the number of digits of precision Set the field width to w Turns on showbase flag Turns on showpoint flag Turns on showpos flag Turns on skipws flag Turns on unitbuf flag Turns on uppercase flag Skip leading white space
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The C++ I/O Manipulators (continued)
A manipulator can be used as part of an I/O expression Here is an example program that uses manipulators to change the format of output:
#include <iostream> #include <iomanip> using namespace std; int main() { cout << setiosflags(ios::fixed); cout << setprecision(2) << 1000243 << endl; cout << setw(20) << "Hello there"; return 0; }
It produces this output
100024 Hello there
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The C++ I/O Class Library
Notice how the manipulators occur in the chain of I/O operations Also, notice that when a manipulator does not take an argument, such as endl in the example, it is not followed by parentheses This is because the address of the manipulator is passed to the overloaded << operator This program uses setiosflags( ) to set cout's scientific and showpos flags:
#include <iostream> #include <iomanip> using namespace std; main() { cout << setiosflags(ios::showpos); cout << setiosflags(ios::scientific); cout << 123 << " " << 12323; return 0; }
The following program uses ws to skip any leading white space when inputting a string into s
#include <iostream> using namespace std; int main() { char s[80]; cin >> ws >> s; cout << s; }
Creating Your Own Manipulator Functions
In addition to overloading the insertion and extraction operators, you can further customize C++ s I/O system by creating your own manipulator functions Custom manipulators are important for two main reasons First, you can consolidate a sequence of several separate I/O operations into one manipulator For example, it is not uncommon to have situations in which the same sequence of I/O operations occurs frequently within a program In these cases you can use a custom manipulator to perform these actions, thus simplifying your source code and preventing accidental errors A custom
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manipulator can also be important when you need to perform I/O operations on a nonstandard device For example, you might use a manipulator to send control codes to a special type of printer or to an optical recognition system Custom manipulators are a feature of C++ that supports OOP, but they also can benefit programs that aren t object oriented As you will see, custom manipulators can help make any I/O-intensive program clearer and more efficient As you know, there are two basic types of manipulators: those that operate on input streams and those that operate on output streams In addition to these two broad categories, there is a secondary division: those manipulators that take an argument and those that don t Here, the creation of parameterless manipulators is described, since they are the most common type of custom manipulator All parameterless manipulator output functions have this skeleton: ostream &manip-name(ostream &stream) { // your code here return stream; } Here, manip-name is the name of the manipulator It is important to understand that even though the manipulator has as its single argument a reference to the stream upon which it is operating, no argument is used when the manipulator is inserted in an output operation The following program creates a manipulator called setup( ) that turns on leftjustification, sets the field width to 10, and specifies the dollar sign as the fill character
#include <iostream> #include <iomanip> using namespace std; ostream &setup(ostream &stream) { streamsetf(ios::left); stream << setw(10) << setfill('$'); return stream; } int main() { cout << 10 << " " << setup << 10; return 0; }
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