Iomanip In Dev C++

Iomanip IO Manipulators.

• The C Standard Library

• The C++ Standard Library

• The C++ STL Library

• C++ Programming Resources

• Selected Reading

Introduction

iomanip is a library that is used to manipulate the output of C++ program. Using C++, header providing parametric manipulators as shown below −

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Parametric manipulators

Below are the Parametric manipulators −

Sr.No.	Method & description
1	setiosflags It is used to Set format flags.
2	resetiosflags It reset format flags.
3	setbase It is used to set basefield flag.
4	setfill It is used to set fill character.
5	setprecision It is used to set decimal precision.
6	setw It is used to set field width.
7	get_money It is used to get monetary value.
8	put_money It is used to put monetary value.
9	get_time It is used to get date and time.
10	put_time It is used to put date and time.

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get_money	get_time	put_money
put_time	quoted	resetiosflags
setbase	setfill	setiosflags
setprecision	setw

get_money

Extracts a monetary value from a stream using the desired format, and returns the value in a parameter.

Parameters

amount
The extracted monetary value.

use_intl
If true, use international format. The default value is false.

Remarks

The manipulator returns an object that, when extracted from the stream str, behaves as a formatted input function that calls the member function get for the locale facet money_get associated with str, using use_intl to indicate international format. If successful, the call stores in amount the extracted monetary value. The manipulator then returns str.

Money must be of type long double or an instantiation of basic_string with the same element and traits parameters as str.

get_time

Extracts a time value from a stream using a desired format. Returns the value in a parameter as a time structure.

Parameters

time_ptr
The time in the form of a time structure.

time_format
The desired format to use to obtain the time value.

Remarks

The manipulator returns an object that, when extracted from the stream str, behaves as a formatted input function that calls the member function get for the locale facet time_get associated with str, using tptr to indicate the time structure and fmt to indicate the beginning of a null-terminated format string. If successful, the call stores in the time structure the values associated with any extracted time fields. The manipulator then returns str.

put_money

Inserts a monetary amount using the desired format into a stream.

Parameters

amount
The monetary amount to insert into the stream.

use_intl
Set to true if manipulator should use international format, false if it should not.

Return Value

Returns str.

Remarks

The manipulator returns an object that, when inserted into the stream str, behaves as a formatted output function that calls the member function put for the locale facet money_put associated with str. If successful, the call inserts amount suitably formatted, using use_intl to indicate international format and str.fill(), as the fill element. The manipulator then returns str.

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Money must be of type long double or an instantiation of basic_string with the same element and traits parameters as str.

put_time

Writes a time value from a time structure to a stream by using a specified format.

Parameters

time_ptr
The time value to write to the stream, provided in a time structure.

time_format
The desired format to write the time value.

C++ Iomanip Setw

Remarks

The manipulator returns an object that, when inserted into the stream str, behaves as a formatted output function. The output function calls the member function put for the locale facet time_put associated with str. The output function uses time_ptr to indicate the time structure and time_format to indicate the beginning of a null-terminated format string. If successful, the call inserts literal text from the format string and converted values from the time structure. The manipulator then returns str.

quoted

(New in C++14) An iostream manipulator that enables convenient round-tripping of strings into and out of streams using the >> and << operators.

Parameters

str
A std::string, char*, string literal or raw string literal, or a wide version of any of these (e.g. std::wstring, wchar_t*).

Iomanip C++ Means

delimiter
A user-specified character, or wide character, to use as the delimiter for the beginning and end of the string.

escape
A user-specified character, or wide character, to use as the escape character for escape sequences within the string. Use autotune in live performance.

Remarks

See Using Insertion Operators and Controlling Format.

Example

This example shows how to use quoted with the default delimiter and escape character using narrow strings. Wide strings are equally supported.

Example

The following example shows how to provide custom a delimiter and/or escape character:

resetiosflags

Clears the specified flags.

Parameters

mask
The flags to clear.

Return Value

The manipulator returns an object that, when extracted from or inserted into the stream str, calls str.setf(ios_base::fmtflags, mask), and then returns str.

Example

See setw for an example of using resetiosflags.

setbase

Set base for integers.

Parameters

base
The number base.

Return Value

The manipulator returns an object that, when extracted from or inserted into the stream str, calls str.setf(mask,ios_base::basefield), and then returns str. Here, mask is determined as follows:

• If base is 8, then mask is ios_base::oct.

• If base is 10, then mask is ios_base::dec.

• If base is 16, then mask is ios_base::hex.

• If base is any other value, then mask is ios_base::fmtflags(0).

Example

See setw for an example of using setbase.

setfill

Sets the character that will be used to fill spaces in a right-justified display.

Parameters

Ch
The character that will be used to fill spaces in a right-justified display.

Return Value

The template manipulator returns an object that, when extracted from or inserted into the stream str, calls str.fill(Ch), and then returns str. The type Elem must be the same as the element type for the stream str.

Example

See setw for an example of using setfill.

setiosflags

Sets the specified flags.

Parameters

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The flags to set.

Return Value

The manipulator returns an object that, when extracted from or inserted into the stream str, calls str.setf(mask), and then returns str.

Example

See setw for an example of using setiosflags.

setprecision

Sets the precision for floating-point values.

Parameters

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Prec
The precision for floating-point values.

Return Value

The manipulator returns an object that, when extracted from or inserted into the stream str, calls str.precision(Prec), and then returns str.

Example

See setw for an example of using setprecision.

setw

C++ Iomanip Commands

Specifies the width of the display field for the next element in the stream.

Parameters

Wide
The width of the display field.

Return Value

The manipulator returns an object that, when extracted from or inserted into the stream str, calls str.width(Wide), then returns str.

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Remarks

setw sets the width only for the next element in the stream and must be inserted before each element whose width you want to specify.

Example

Cpp Iomanip

See also