Matsmath questions

• How to force a running program to flush the contents of its I/O buffers to disk with external means?
• How to transform a flow chart into an implementation? [closed]
• Fast integer matrix multiplication with bit-twiddling hacks
• Untying Knuth's knots: how to restructure spaghetti code?
• How to link old C code with reserved keywords in it with C++?
• How to evaluate zero sets fast?

Matsmath answers