Start here
Funge-98 Features in Depth
A tour of what Funge-98 adds beyond the original Befunge: extra instructions, multiple pointers, a stack of stacks, file access, extensions and more.
Programming in Funge
Funge-98 in Depth
Advanced Funge-98 features explained one at a time.
Asking the Interpreter for System Information
How the Funge-98 info instruction works: what facts it reports about the interpreter and the program, how to pick one item, and why portable code checks them.
Delta Vectors and Arbitrary Directions
Learn how Funge-98 describes pointer movement as a delta vector, how the absolute-delta instruction sets it, and what diagonal and long steps make possible.
File Input and Output in Funge-98
A general look at how Funge-98 reads files into the grid and writes grid regions to files, with notes on flags, text versus binary, and safety.
Loading Extensions Safely
How a Funge-98 program asks its interpreter to load optional extensions, what can go wrong, and habits that keep programs predictable and safe to run.
Repeating Instructions with Iterate
How the Funge-98 iterate instruction repeats the next instruction a given number of times, with a traced example, edge cases and where it shortens code.
Running Several Pointers with the Split Instruction
How the Funge-98 split instruction creates extra instruction pointers, how they interleave on a shared grid, and how each one ends, with design cautions.
Storage Offset and Relocatable Code
How the Funge-98 storage offset shifts the origin used by get and put, and how that lets one routine and its data work wherever it is placed on the grid.
What Happens When an Instruction Is Unknown
Funge-98 treats unsupported or unassigned instructions as a reflection that turns the pointer around. Learn why, how it shows up, and what it means for portability.
Working with the Stack of Stacks
How Funge-98 block begin and block end create separate stacks, what moves between them, the stack-under-stack instruction, and why programs use isolation.
Related topics