General :: Can't Compile C++ Programs On OPENSUSE

pgm of mine is not getting compiled

#include<iostream>
int main()
{
cout<<"Hi
";
}//Saved as g.cpp

The foll. error is shown on compiling as c++ g.cpp or gcc c.cpp or cc g.cpp
and i've gcc 4.5

g.cpp: In function int main():
g.cpp:5:2: error: cout was not declared in this scope
v