Last Class (sections 3.4 - 3.6)

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# Last Class (sections 3.4 - 3.6) - PowerPoint PPT Presentation

Last Class (sections 3.4 - 3.6). What is a variable? rules for naming variables garbage values strings, chars, boolean rules for naming variables Integer Variables example from book +, -, *. Data Types: Reals. A number that contains a decimal point can begin with a ‘+’ or a ‘-’

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## PowerPoint Slideshow about ' Last Class (sections 3.4 - 3.6)' - samantha-mejia

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Presentation Transcript
Last Class (sections 3.4 - 3.6)
• What is a variable?
• rules for naming variables
• garbage values
• strings, chars, boolean
• rules for naming variables
• Integer Variables
• example from book
• +, -, *
Data Types: Reals
• 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
Real Operators
• +, -
• *, /
• operator precedence
• PEMDAS
Integer Operators
• +, -
• *
• DIV “integer division”
• MOD “remainder operator”
• operator precedence
Mixed mode
• 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).
Correcting syntax errors
• Go over example in book