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Learn Java: Manipulating Variables

Addition and Subtraction

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!