Learn SEED7 with Real Code Examples

Seed7 supports redefining the language through user-defined syntax, operators, and new statements.

It compiles to C and is then compiled to native binaries, offering high performance.

It emphasizes strong typing, type-safe operations, large standard libraries, and clean expressive code.

Strong static type checking

Procedures, functions, and generic types

Custom operators and statements

Multiple return values

Uniform syntax across datatypes

Types, subtypes, and strong typing

Procedures and functions

Custom operators

Statements and user-defined grammar

Modules and libraries

src/ - main program files

lib/ - Seed7 libraries

build/ - compiled binaries

scripts/ - automation

modules/ - custom syntax and DSL components

Write .sd7 program

Compile to C using Seed7 compiler

Compile generated C with GCC/Clang

Run resulting binary

Iterate and refine syntax/logic

Beginner: console apps and basic operators

Intermediate: custom operators, libraries

Advanced: DSL creation and grammar extensions

Expert: compilers and interpreters

Enterprise: specialized domain languages

More extensible than Pascal/Ada

Safer and more structured than Lua

More readable than Haskell extensions

Less widespread than Python or C++

Better DSL support than Java/C#

2005 – Initial release

2010 – Improved libraries and grammar tools

2015 – Enhanced C backend

2020 – Better Unicode and container types

2025 – Active but niche development

Subtype: specialized type

Operator: custom symbolic function

Statement: language-level command

Grammar Extension: modification of syntax

C Backend: compilation pipeline