I am trying to compile the simple program below. But, it's not compiling & gives error:

```
error C2065: 'cout' : undeclared identifier

```

I want to ask you that why this program doesn't work though I've included `iostream` header file in it?

```
#include <iostream>

void function(int) { cout << “function(int) called” << endl; }
void function(unsigned int) { cout << “function(unsigned int) called” << endl; }
    int main()
    {
        function(-2);
        function(4);
        return 0;
    }

```

Thanks in advance.