Variables

• Variables are used to name an object reference.
• The variable name is the map that directs the program to the object. This is known as the object reference.
• Variable names are usually written in snake_case to make it easier to read.

Ints

• This week, we focused on two types of variables: int and double.
• Ints are a type of variable.
• They store numbers that are not fractions or decimals.

Doubles

• Doubles are another type of numerical variables
• They store numbers that are fractions or decimals.

Differences Between an Int and a Double

• ints are used for whole numbers only
• doubles are used for decimal numbers only
• Remember: Use 2.0 or 1.0 for double only when you want to the result of your program to be a decimal. Otherwise use int for whole numbers

Operations

• Operations are used in addition to defining a variable.
• These operations are very useful because you use them every day!
• EX: + (addition) , - (subtraction), * multiplication
• The computer is so smart that it can perform these operations like a calculator that you use in school.
• Here is are examples that can be used in Python: