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## Using Vectors to Collect Data Items

- You must specify which slot you want to use with the `[]` operator.

  >     salaries[4] = 35000;

- The number inside the brackets is called an index.
- Because salaries is a vector of double values, a slot such as `salaries[4]` can be used just like any variable of type double.

  >     cout << salaries[4] << "\n";

- In C++, the slots of vectors are numbered starting at 0.

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