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Published byGriffin Robertson Modified over 9 years ago
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VARIABLES: Your Own Piece of the ram
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Why Use Variables? To save a piece of data in memory To save a piece of data in memory To store results of a calculation To store results of a calculation To make code easier to modify/understand To make code easier to modify/understand
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A variable is a named memory location that stores a value.
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Variables must be declared before they can be used! DimIntlength As Integer Intlength - variable name Integer - data type Dim - stands for dimension As – reserved word
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Variable Naming Rules Must begin with a letter. Must begin with a letter. Must only contain letters, digits, and underscores (_). Must only contain letters, digits, and underscores (_). Must not be a keyword (i.e. End, Sub, If). Must not be a keyword (i.e. End, Sub, If). Use the proper abbreviation Use the proper abbreviation (on the naming convention slide). (on the naming convention slide).
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Naming Conventions Shortsrt Integerint Longlng Decimaldec Single sng Doubledbl Stringstr Charchr Datedte Booleanbln
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Variable Data Types Numbers ( Whole Numbers or Decimals) Numbers ( Whole Numbers or Decimals) Whole Numbers Short, Integer, Long Decimal Single, Double,Decimal Text (String or Char) Text (String or Char) Dates (Date) Dates (Date) State (True or False: Boolean) State (True or False: Boolean)
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How Do You Choose What Data Type to Use? Short -32,768 to 32,767 Integer-2,147,483,648 to 2,147,483,647 Longlarge integers Singlenumbers containing a decimal Doublelarge decimal numbers Date dates in m/d/yyyy format Decimalnumbers used for currency Chara single character Stringa set of characters in “ ” BooleanTrue or False
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What Data Type Do You Use? 1. Number of students in class 2. Class average Choices 3. Name of the School 4. Grade Given as a Letter
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What Kind of Variable Do You Use? 5. Distance to the Moon 6. Has the Bill Been Paid? Choices 7. Cost of a pizza 8. Date of the Last Day of School
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Declaration Statements 1. Number of students in class 2. Class average 3. Name of the School 4. Grade Given as a Letter 5. Distance to the Moon 6. Has the Bill Been Paid? 7. Cost of a pizza 8. Date of the Last Day of School Dim srtstudent as short Dim srtstudent as short _______________________________ _________________________
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