Values and types

Lesson from the WasmPascal in-browser Learn Pascal tutorial. Source: webpascal/index.html.

Pascal is a typed language: every variable and function result has a type, declared ahead of use. wasmpascal's types are:

• Integers: Integer/LongInt (32-bit signed), Cardinal/LongWord (unsigned), plus ShortInt (8-bit), SmallInt/Word (16-bit), Byte (unsigned 8-bit).
• Floats: Real/Double (64-bit), Single (32-bit).
• Booleans: Boolean, true / false.
• Characters: Char (one byte).
• Enumerations: type Color = (Red, Green, Blue) gives named values with ordinals 0, 1, 2 — usable in case, array bounds, and for counters. Named subranges (type Index = 1..10) bound arrays and variables the same way.
• Structured: records, static arrays (including multi-dim array[1..3, 1..4] of T with a[i, j] indexing), pointers, and strings (including fixed String[n]) — their own lessons below.

Floats and integers mix in expressions: integer arguments to math builtins are promoted to floats automatically.