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Learn Java: Manipulating Variables

In our bank account example from the last exercise, we used `+` to add!

``````double balance = 20000.99;
double depositAmount = 1000.0;
double updatedBalance = balance + depositAmount;
//updatedBalance now holds 21000.99``````

If we wanted to withdraw from the balance, we would use `-`:

``````double withdrawAmount = 500;
double updatedBalance = balance - withdrawAmount;
//updatedBalance now holds 19500.99``````

Addition and subtraction work with `int`s as well!

``int numPicturesOfCats = 60 + 24;``

If you had 60 pictures of cats on your phone, and you took 24 more, you could use the above line of code to store `84` in `numPicturesOfCats`.

### Instructions

1.

Create an `int` variable called `animalsInZoo` that holds the amount of zebras plus the amount of giraffes at the zoo.

Then, print your `animalsInZoo` variable.

2.

Two of the zebras have been traded to a neighboring rival zoo. Subtract 2 from the number of zebras and store the result in a variable called `numZebrasAfterTrade`.

Then, print the `numZebrasAfterTrade` variable!