29 Input/output library [input.output]

29.4 Standard iostream objects [iostream.objects]

29.4.3 Narrow stream objects [narrow.stream.objects]

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istream cin;
1
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The object cin controls input from a stream buffer associated with the object stdin, declared in <cstdio>.
2
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After the object cin is initialized, cin.tie() returns &cout.
Its state is otherwise the same as required for basic_­ios<char>​::​init.
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ostream cout;
3
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The object cout controls output to a stream buffer associated with the object stdout, declared in <cstdio>.
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ostream cerr;
4
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The object cerr controls output to a stream buffer associated with the object stderr, declared in <cstdio>.
5
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After the object cerr is initialized, cerr.flags() & unitbuf is nonzero and cerr.tie() returns &cout.
Its state is otherwise the same as required for basic_­ios<char>​::​init.
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ostream clog;
6
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The object clog controls output to a stream buffer associated with the object stderr, declared in <cstdio>.