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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: