Compile C code with Borland Turbo C (TCC.EXE) and run the resulting DOS executable, capturing stdout/stderr, exit code, timing, and structured diagnostics. The everyday workhorse.

Compile-only syntax/semantic check (no execution). Returns structured errors and warnings with line numbers — perfect for fast iteration and CI-style validation.

Static analysis of C source WITHOUT compiling: flags unsafe gets(), scanf-missing-&, assignment-in-if, unbalanced braces, missing main(), unchecked malloc, Turbo C float I/O pitfalls, and more. Instant, no toolchain required.

Look up a Turbo C / Borland compiler, linker, or runtime message and get a plain-English cause + concrete fix. Feed it the raw error text (e.g. "Undefined symbol 'x' in function main").

Compile C to a Turbo C assembly listing (TCC -S) and return the generated .ASM. Great for teaching how C maps to 16-bit x86, inspecting codegen, or optimization study.

Browse the built-in library of classic Turbo C programs (hello, Fibonacci, prime sieve, bubble sort, Towers of Hanoi, structs, file I/O, conio colors, BGI graphics, matrix multiply, number-guessing game, Pascal's triangle). Returns ids you can run.

Return the full C source of a built-in example by id (see list_examples).

Compile and run a built-in example by id in one shot (uses its sample stdin when defined).

Compile once, then run the program N times (default 5) and report min/max/avg execution time in milliseconds. Useful for comparing algorithm variants on the real DOS runtime.

Reformat C source: re-indent by brace depth, tidy trailing whitespace, and collapse blank-line runs. Dependency-free; returns the formatted code.

Inspect the Turbo C toolchain: verify TCC.EXE, INCLUDE, LIB, and BGI paths, count available headers, report workspace sessions, and list any problems with fix hints. Run this first if compiles fail.

Delete old scratch session directories created by compiles/runs. Optionally keep the N most recent. Frees disk and keeps the DOS work root tidy.