Find the error(s) in each of the following program segments, and explain how the error(s) can be corrected :

```
void f(double a); {
float a;
cout << a << endl;
}
```

Errors: Semicolon after the right parenthesis that encloses the parameter list, and re- defining the parameter a in the function definition.
Corrections: Delete the semicolon after the right parenthesis of the parameter list, and delete the declaration float a;.