31 Input/output library [input.output]

31.4 Standard iostream objects [iostream.objects]

31.4.3 Narrow stream objects [narrow.stream.objects]

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