- The C Standard Library
- The C++ Standard Library
C Manipulator setw. C manipulator setw function stands for set width. This manipulator is used to specify the minimum number of character positions on the output field a variable will consume. This manipulator is declared in header file iomanip. Mar 01, 2012 Tag Archives: setw example C setw Posted on March 1, 2012 by dunsta. Using setw in C is a good way to make text output look sharper. The iomanip library provides the user with the setw function which creates sized fields. Use an integer as a parameter to set the width of the field the text will be stored in. Formatting Cout Output in C using iomanip By Alex Allain Creating cleanly formatted output is a common programming requirement-it improves your user interface and makes it easier to read any debugging messages that you might print to the screen. By naming your sourcefile with the.c extension you force the compiler to perform C compilation and Dev-C ti use C compilation settings. Dev-C's C compilation settings do not include the C backward compatibility directory (for obvious reasons), and, and even if it did the iostream.h header file would not compile as C code.
- The C++ STL Library
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Description
The C++ function std::setprecision behaves as if member precision were called with n as argument on the stream on which it is inserted/extracted as a manipulator (it can be inserted/extracted on input streams or output streams).
It is used to sets the decimal precision to be used to format floating-point values on output operations.
Declaration
Following is the declaration for std::setprecision function.
Parameters
n − New value for the decimal precision.
Return Value
It returns unspecified. This function should only be used as a stream manipulator.
Exceptions
Basic guarantee − if an exception is thrown, the stream is in a valid state.
Data races
The stream object on which it is inserted/extracted is modified. Concurrent access to the same stream object may introduce data races.
Iomanip C++ Example
Example
In below example explains about setprecision function.
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Let us compile and run the above program, this will produce the following result −
Iomanip In C++
