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[iostream.syn]
# 31 Input/output library [[input.output]](./#input.output)
## 31.4 Standard iostream objects [[iostream.objects]](iostream.objects#iostream.syn)
### 31.4.1 Header <iostream> synopsis [iostream.syn]
[🔗](#header:%3ciostream%3e)
#include <ios> // see [[ios.syn]](ios.syn "31.5.1Header <ios> synopsis")#include <streambuf> // see [[streambuf.syn]](streambuf.syn "31.6.1Header <streambuf> synopsis")#include <istream> // see [[istream.syn]](istream.syn "31.7.1Header <istream> synopsis")#include <ostream> // see [[ostream.syn]](ostream.syn "31.7.2Header <ostream> synopsis")namespace std {extern istream cin; extern ostream cout; extern ostream cerr; extern ostream clog; extern wistream wcin; extern wostream wcout; extern wostream wcerr; extern wostream wclog;}