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Delphi

Windows desktop business apps Pascal style OOP and rapid UI tools

English

Definition first

What Delphi means

Delphi is a programming language for writing exact instructions, often used for Windows desktop business apps Pascal style OOP and rapid UI tools. Start with one mental model: input goes through steps and becomes output.

Minimum run factsFile Project.dprRun Compile in Delphi IDEHabit Keep form events thin and move logic into testable units
Program

An ordered set of instructions. It reads input, follows rules, and produces output.

Value and variable

A value is data. A variable is the name you use to hold and reuse that data.

Function

A named piece of work. It takes input, does one job, and can return a result.

Runtime

Delphi or Free Pascal is the place that actually runs code from Project.dpr.

First readable code

Program output

entry point output syntax Writeln
Writeln(42);
Output 42

Language lineage

Delphi family tree

See where Delphi comes from, which languages feel close, and what to learn next.

roots
PascalSmalltalkWindows
currentDelphiObject Pascal family
familyObject Pascal family
best used for

desktop apps, forms, and legacy business tools

Zero base path

1Read one rule2Predict output3Type from memory4Run checklist5Repeat with one change

Question bank

Search before practice

Pick a stage or search across the open programming bank. Jump straight to the matching drill.

18 matching questions
Q 1ChoiceStage 1 definitions

Delphi practice 1

Delphi question 1. Choose the statement that matches printing a value.

Q 2ChoiceStage 1 definitions

Delphi practice 2

Delphi question 2. Choose the statement that matches naming a value.

Q 3ChoiceStage 1 definitions

Delphi practice 3

Delphi question 3. Choose the statement that matches reusable function.

Q 4ChoiceStage 1 definitions

Delphi practice 4

Delphi question 4. Choose the statement that matches basic collection.

Q 5ChoiceStage 1 definitions

Delphi practice 5

Delphi question 5. Choose the statement that matches printing a value.

Q 6ChoiceStage 1 definitions

Delphi practice 6

Delphi question 6. Choose the statement that matches naming a value.

Q 7ChoiceStage 1 definitions

Delphi practice 7

Delphi question 7. Choose the statement that matches reusable function.

Q 8ChoiceStage 1 definitions

Delphi practice 8

Delphi question 8. Choose the statement that matches basic collection.

Q 9ChoiceStage 1 definitions

Delphi practice 9

Delphi question 9. Choose the statement that matches printing a value.

Q 10ChoiceStage 1 definitions

Delphi practice 10

Delphi question 10. Choose the statement that matches naming a value.

Q 11ChoiceStage 1 definitions

Delphi practice 11

Delphi question 11. Choose the statement that matches reusable function.

Q 12ChoiceStage 1 definitions

Delphi practice 12

Delphi question 12. Choose the statement that matches basic collection.

Q 13ChoiceStage 1 definitions

Delphi practice 13

Delphi question 13. Choose the statement that matches printing a value.

Q 14ChoiceStage 1 definitions

Delphi practice 14

Delphi question 14. Choose the statement that matches naming a value.

Q 15ChoiceStage 1 definitions

Delphi practice 15

Delphi question 15. Choose the statement that matches reusable function.

Q 16ChoiceStage 1 definitions

Delphi practice 16

Delphi question 16. Choose the statement that matches basic collection.

Q 17ChoiceStage 1 definitions

Delphi practice 17

Delphi question 17. Choose the statement that matches printing a value.

Q 18ChoiceStage 1 definitions

Delphi practice 18

Delphi question 18. Choose the statement that matches naming a value.

Multiple choice

Delphi practice 1

Q 1Choicenew

Delphi question 1. Choose the statement that matches printing a value.

Writeln(42);

Reference

Patterns for Project.dpr

Delphi or Free PascalCompile in Delphi IDE
Recall from memoryRead a small point then write it back without looking
Trace the codeWrite variable values line by line before you run the answer
Type it yourselfCopy less type more and fix one small error at a time

entry point output syntax Writeln

Program output

Writeln(42);
  • Run the smallest file first
  • Print one known value
  • Check the output before adding more code

variables assignment types var

Values and names

var total: Integer;
begin
  total := 42;
  Writeln(total);
end.
  • Give values readable names
  • Keep one idea per line while learning
  • Trace the value before changing it

function collection Array

Functions and collections

function Add(a, b: Integer): Integer;
begin
  Result := a + b;
end;

var scores: array[0..1] of Integer;
begin
  Writeln(Length(scores));
end.
  • Keep functions small
  • Return useful values
  • Use the common collection before reaching for frameworks