DMarlon Studio
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Basic Pascal course

From scratch: everything you need to write your first programs. In DMarlon Studio, Pascal powers desktop apps with Lazarus (like the offline Odoo demo) and the console.

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  1. 1Hello, worldYour first Pascal program: WriteLn prints text and results to the console. Compile it with Free Pascal or run it with F9 in DMarlon Studio.Lesson 1
  2. 2Variables and basic typesDeclare variables in Pascal's var block with the basic types (Integer, Double, Char, Boolean and String) and give them values with :=.Lesson 2
  3. 3Arithmetic: div, mod and /Do maths in Pascal: div for whole-number division, mod for the remainder, / for decimal division, and Trunc and Round to get back to integers.Lesson 3
  4. 4Formatting outputShape numbers in Pascal: WriteLn with :width:decimals and the Format function from SysUtils to line up the columns of a café receipt.Lesson 4
  5. 5Reading from the keyboardAsk the user for data with ReadLn in Pascal: text and numbers, one per line or several on the same line, to work out the price of cinema tickets.Lesson 5
  6. 6if, then and elseMake decisions in Pascal with if, then and else: weather warnings and exam grades, with begin…end blocks and else if chains.Lesson 6
  7. 7The case statementChoose between many values with case in Pascal: days of the week, grade ranges and the menu of a vending machine.Lesson 7
  8. 8Booleans and comparisonsCompare values in Pascal with =, <>, < and >, and combine conditions with and, or, not and xor to decide who rides the roller coaster.Lesson 8
  9. 9while and repeat…untilRepeat code in Pascal while a condition holds: while checks it before each pass and repeat…until checks it at the end.Lesson 9
  10. 10for loops with to and downtoCount with for in Pascal: to counts up, downto counts down, plus running totals, Char counters and nested loops for cinema seats.Lesson 10
  11. 11Static arraysStore several values of the same type in a Pascal array: a week of temperatures, with the average and the hottest day.Lesson 11
  12. 12Working with stringsWork with text in Pascal: join with +, then Length, Copy, Pos, UpperCase and LowerCase to split an email address into user and domain.Lesson 12
  13. 13ProceduresGroup named blocks of code into Pascal procedures, with parameters and local variables, to print a bakery receipt.Lesson 13
  14. 14Functions and ResultWrite Pascal functions that return a value through Result: Celsius to Fahrenheit, prices with VAT and whether a year is a leap year.Lesson 14
  15. 15var and const parametersPass Pascal parameters by value, by reference with var, and read-only with const, and return several results from one procedure.Lesson 15
  16. 16RecordsGroup related data in a Pascal record: a stationery shop's products with name, price and stock, plus functions that use them.Lesson 16
  17. 17Enumerated types and setsDefine enumerated types and sets in Pascal: a shop's opening days with in, Include, Exclude, Ord, Succ and set intersection.Lesson 17
  18. 18Dynamic arraysUse Pascal dynamic arrays that grow and shrink with SetLength: a shopping cart with routines to add items and total them up.Lesson 18
  19. 19Text filesWrite and read text files in Pascal with AssignFile, Rewrite, Append, Reset, ReadLn and CloseFile: a shopping list saved to disk.Lesson 19
  20. 20Project: a shop invoiceA small Pascal project that brings together records, arrays, loops, procedures and Format to print the invoice of a computer shop.Lesson 20