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QBasic

QBasic. Chapter 3 – Fundamental Statements. 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. QBasic Statement Components.

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QBasic

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  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 = 50.00 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 400.00 • 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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