Counter and Theme Toggle - Using Constants - Seed7 Typing CST Test
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Counter and Theme Toggle - Using Constants — Seed7 Code
Uses constants for theme strings instead of inline text.
const darkTheme: string := "Dark";
const lightTheme: string := "Light";
var count: integer := 0;
var isDark: boolean := false;
procedure updateUI;
begin
put "Counter: "; put count; putnl;
put "Theme: "; put (if isDark then darkTheme else lightTheme); putnl;
end procedure;
procedure toggleTheme;
begin
isDark := not isDark;
updateUI;
end procedure;
# Simulate actions
updateUI;
toggleTheme;Seed7 Language Guide
Seed7 is a high-level, general-purpose programming language designed for extreme flexibility, strong typing, and extensible syntax. It allows developers to define new operators, statements, and even change the language’s grammar, making it one of the most customizable languages ever created. It focuses on safety, readability, and powerful abstractions.
Primary Use Cases
- ▸Domain-Specific Languages (DSLs)
- ▸Algorithmic and numerical computing
- ▸Parser and compiler development
- ▸Scripting and automation
- ▸General-purpose application development
Notable Features
- ▸User-defined syntax and operators
- ▸Powerful type system with parametric polymorphism
- ▸Native code generation via C backend
- ▸Large standard library
- ▸Extensible language semantics and grammar
Origin & Creator
Created by Thomas Mertes starting in 2005 as an ambitious alternative to Ada, Pascal, and other extensible languages.
Industrial Note
Seed7 is used in academic environments and by enthusiasts who need custom domain-specific languages (DSLs), interpreters, and complex mathematical/linguistic processing systems. Its extensibility makes it ideal for prototyping language constructs and embedded DSLs.