Question on "ssh" login

Gentle People,

I want to use ssh to login. I want to hard code the password. I tried
to use following line

system ("ssh user@hostname <<INPW
password_goes_here
INPW
");

I get following error message.
Pseudo-terminal will not be allocated because stdin is not a terminal.
And program will ask to type password manually.

Any help will be greatly appreciated.
Regards