Vectors and Arrays

Vector Subscripts

Trying to access a slot that does not exist in the vector is an error.

vector<double> staff(10);
cout << staff[10]; /* legal subscripts are 0 until 9 */

The C++ standard implementation of vector generates no error message.
If you make an index error, you silently read or overwrite another memory location.
When a vector is defined without a size parameter, it is empty and can hold no elements.
```
vector<double> salaries; /* no size given */
salaries[0] = 35000;
```