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Last Class (sections 3.4 - 3.6)PowerPoint Presentation

Last Class (sections 3.4 - 3.6)

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Last Class (sections 3.4 - 3.6)

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- What is a variable?
- rules for naming variables
- garbage values
- strings, chars, boolean
- rules for naming variables

- Integer Variables
- example from book
- +, -, *

- A number that contains a decimal point
- can begin with a ‘+’ or a ‘-’
- must have digits on both sides of the decimal
- cannot contain
- commas
- an embedded blank
- non-numeric characters
- a’+’ or a ‘-’ at the end of the value

- +, -
- *, /
- operator precedence
- PEMDAS

- +, -
- *
- DIV“integer division”
- MOD“remainder operator”
- operator precedence

- You can assign an integer value to a real variable. The compiler automatically converts the integer into a real (ie. 5 -> 5.0)
- You cannot assign a real to an integer.
- Mixed mode is when both integers and reals are on the right side of an expression (a real variable must be on the left side).

- readln

- Go over example in book