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Headers and the preprocessor

Get started0/320 / 32 required exercisesRecommended

Structure your code0/250 / 25 required exercisesAhead

Text0/290 / 29 required exercisesAhead

Memory0/150 / 15 required exercisesAhead

Your own types0/190 / 19 required exercisesAhead

Structs, unions, enums Headers and the preprocessor Linked lists Stacks, queues, trees Generic code

The machine0/180 / 18 required exercisesAhead

The system0/40 / 4 required exercisesAhead

Learning C
Your own types
Headers and the preprocessor

Headers and the preprocessor

Your program is growing up: more files, cleaner boundaries, fewer copy-paste disasters.

Write a header that survives being included twice
Hide an implementation behind an incomplete type
Write a macro whose parentheses preserve the caller's expression

3 exercisesDifficulty 2 to 452 XP availableView in graph

Required exercises

3 exercises

header_guard

void counter_add(counter *item, int amount)

macro_flags

unsigned int update_flag(unsigned int value, unsigned int bit, int enabled)

opaque_meter

meter *meter_create(int initial)

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