Put a single character into output stream.
  Inserts the character ch if output stream is ready, otherwise badbit is set.

Parameters.

ch

Character to be inserted.

Return Value.
  *this

Example.

// typewriter
#include <iostream>
#include <fstream>
using namespace std;

int main () {

  char ch;
  ofstream outfile ("test.txt");

  do {
    ch=cin.get();
    outfile.put (ch);
  } while (ch!='.');

  return 0;
}

Basic template member declaration (basic_ostream<charT,traits>):

typedef charT char_type; basic_ostream& put (char_type ch);

See also.
  write, operator<<, istream::get,
  ostream class