std::showpoint, std::noshowpoint

 

C++

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Feature test macros(C++20)

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I/O manipulators

Print functions(C++23)

C-style I/O

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basic_osyncstream (C++20)

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streamoff

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iostream_category (C++11)

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Input/output manipulators

Floating-point formatting
showpointnoshowpoint setprecision	fixedscientifichexfloatdefaultfloat (C++11)(C++11)
Integer formatting
setbase showbasenoshowbase	dechexoct
Boolean formatting
boolalphanoboolalpha
Field width and fill control
setfill setw	internalleftright
Other formatting
showposnoshowpos	uppercasenouppercase
Whitespace processing
ws ends	skipwsnoskipws
Output flushing
flush endl flush_emit (C++20)	unitbufnounitbuf emit_on_flushnoemit_on_flush (C++20)(C++20)
Status flags manipulation
resetiosflags	setiosflags
Time and money I/O
get_money (C++11) get_time (C++11)	put_money (C++11) put_time (C++11)
Quoted manipulator
quoted (C++14)

 

Defined in header <ios>
std::ios_base& showpoint(std::ios_base& str );	(1)
std::ios_base& noshowpoint(std::ios_base& str );	(2)

Enables or disables the unconditional inclusion of the decimal point character in floating-point output. Has no effect on input.

1) Enables the showpoint flag in the stream str as if by calling str.setf(std::ios_base::showpoint).

2) Disables the showpoint flag in the stream str as if by calling str.unsetf(std::ios_base::showpoint).

This is an I/O manipulator, it may be called with an expression such as out << std::showpoint for any out of type std::basic_ostream or with an expression such as in >> std::showpoint for any in of type std::basic_istream.

The character to use as decimal point character is determined by the numpunct facet of the locale imbued in the stream at the time of output, as described in std::num_put::put.

Parameters

str

-

reference to I/O stream

Return value

str (reference to the stream after manipulation).

Example

Run this code

#include <iostream>   int main(){std::cout<<"1.0 with showpoint: "<< std::showpoint<<1.0<<'\n'<<"1.0 with noshowpoint: "<< std::noshowpoint<<1.0<<'\n';}

Output:

1.0 with showpoint: 1.00000 1.0 with noshowpoint: 1

See also

resetiosflags	clears the specified ios_base flags (function)
setiosflags	sets the specified ios_base flags (function)