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QBasic Chapter 3 – Fundamental Statements. QBasic Statement Components Keywords Constants – Numeric constants Real numbers – include decimal points Integers.

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Presentation on theme: "QBasic Chapter 3 – Fundamental Statements. QBasic Statement Components Keywords Constants – Numeric constants Real numbers – include decimal points Integers."— Presentation transcript:

1 QBasic Chapter 3 – Fundamental Statements

2 QBasic Statement Components Keywords Constants – Numeric constants Real numbers – include decimal points Integers – w/out decimal points No commas, symbols (only – sign) or blank spaces Exponential notation is used

3 QBasic Statement Components Constants – Character string constants Alphanumeric data Only one set of double quotes Length of a string – max 32,767 characters Variables – Can only store one value at a time – Referred to by addresses – Variables are named – Only first 40 characters are recognized in QBasic – QBasic does not differentiate between upper & lowercase – Use descriptive variable names

4 QBasic Statement Components Numeric Variables – Supplied by the programmer or – Calculated during program execution – Begins with a letter, followed by letters, digits, and periods – Cannot have blank spaces

5 QBasic Statement Components String Variables – Stores character strings – Begins with a letter followed by letters or digits and always end with a $ Keywords – Cannot be used as variable names – READ, LIST, PRINT, LET and END

6 Simple QBasic Statements CLS – Clear Screen Documenting a Program – REM – Single quotation mark (‘) – Can be used anywhere in the program REM **** This program was created by *** ‘ This program was created by

7 Simple QBasic Statements Assigning Values to Variables – Assignment Statement – LET keyword is optional LET Rate =.0825 LET Tuition = Heading$ = “Inventory Report” Classification = 4

8 Simple QBasic Statements Arithmetic Operations – Composed of numeric constants, numeric variables, and arithmetic operators – +, -, /, *, ^ LET Tuition = Hours * 50 Order of Operations - PEMDAS

9 Simple QBasic Statements Displaying Results – PRINT PRINT Heading$, Tuition would result in: Your tuition amount is Displaying Literals – Group of characters containing just about anything PRINT “JUNK $%^ 4567” would result in: JUNK $%^ 4567

10 Simple QBasic Statements END – Stops program execution Immediate Window – Execute statements as soon as ENTER is pressed

11 Simple QBasic Statements HELP – F1 key or HELP menu – Highlight menu option & then press F1 or right mouse button – Press ESC to close HELP screen – Alt-H for list of HELP topics Smart Editor


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