Programming definitions

The definitions in this section are only likely to be useful when you are writing nontrivial macros, not when writing a document.

• Category codes: Changing category codes.
• Allocation macros: Non-outer versions of \newcount et al.
• Iteration: Doing `for' loops in TeX.
• Macro arguments: Reading and ignoring them.
• Converting to characters: Normalizing control sequences and spaces.
• Expansion: Controlling expansion.
• Obeying spaces: Making whitespace count anywhere.
• Writing out numbers: Making `1' into `one'.
• Mode-specific penalties
• Auxiliary files: Testing for their existence.