Hey all I have a bit of a problem, I need a little help fixing this little error problem. The Error is "error C2668: 'sqrt' : ambiguous call to overloaded function" it is on this line of code:

```
void myint::square()
{
// Output square root
cout << "The square root of " << num << " is " << sqrt(num) << endl;
}
```

can someone help me?