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[narrow.stream.objects]
# 31 Input/output library [[input.output]](./#input.output)
## 31.4 Standard iostream objects [[iostream.objects]](iostream.objects#narrow.stream.objects)
### 31.4.3 Narrow stream objects [narrow.stream.objects]
[🔗](#lib:cin)
`istream cin;
`
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L545)
The object cin controls input from a stream buffer associated with the object stdin,
declared in [<cstdio>](cstdio.syn#header:%3ccstdio%3e "31.13.1 Header <cstdio> synopsis [cstdio.syn]")[.](#1.sentence-1)
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L550)
After the objectcin is initialized,cin.tie() returns&cout[.](#2.sentence-1)
Its state is otherwise the same as required for[basic_ios<char>​::​init](istream.cons#lib:basic_ios,init "31.7.5.2.2 Constructors [istream.cons]")[.](#2.sentence-2)
[🔗](#lib:cout)
`ostream cout;
`
[3](#3)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L567)
The object cout controls output to a stream buffer associated with the object stdout,
declared in [<cstdio>](cstdio.syn#header:%3ccstdio%3e "31.13.1 Header <cstdio> synopsis [cstdio.syn]")[.](#3.sentence-1)
[🔗](#lib:cerr)
`ostream cerr;
`
[4](#4)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L579)
The object cerr controls output to a stream buffer associated with the object stderr,
declared in [<cstdio>](cstdio.syn#header:%3ccstdio%3e "31.13.1 Header <cstdio> synopsis [cstdio.syn]")[.](#4.sentence-1)
[5](#5)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L584)
After the objectcerr is initialized,cerr.flags() & unitbuf is nonzero and cerr.tie() returns &cout[.](#5.sentence-1)
Its state is otherwise the same as required for[basic_ios<char>​::​init](istream.cons#lib:basic_ios,init "31.7.5.2.2 Constructors [istream.cons]")[.](#5.sentence-2)
[🔗](#lib:clog)
`ostream clog;
`
[6](#6)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L600)
The object clog controls output to a stream buffer
associated with the object stderr,
declared in [<cstdio>](cstdio.syn#header:%3ccstdio%3e "31.13.1 Header <cstdio> synopsis [cstdio.syn]")[.](#6.sentence-1)