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basic_istream::putback

Puts a specified character into the stream.

basic_istream<Elem, Tr>& putback(
    char_type _Ch
);

Parameters

  • _Ch
    A character to put back into the stream.

Return Value

The stream (*this).

Remarks

The unformatted input function puts back _Ch, if possible, as if by calling rdbuf->sputbackc. If rdbuf is a null pointer, or if the call to sputbackc returns traits_type::eof, the function calls setstate(badbit). In any case, it returns *this.

Example

// basic_istream_putback.cpp
// compile with: /EHsc
#include <iostream>
using namespace std;

int main( ) 
{
   char c[10], c2, c3;

   c2 = cin.get( );
   c3 = cin.get( );
   cin.putback( c2 );
   cin.getline( &c[0], 9 );
   cout << c << endl;
}
  qw
q

Requirements

Header: <istream>

Namespace: std

See Also

Reference

basic_istream Class

iostream Programming

iostreams Conventions