C

📚 Standard C Library Headers

These are the standard headers defined by ISO C.

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📂 Input / Output

• <stdio.h> — Input/output

✍️ Strings & Text

• <string.h> — String handling
• <ctype.h> — Char classification & conversion
• <wchar.h> — Wide char utilities
• <wctype.h> — Wide char classification
• <uchar.h> — UTF-16/32 utilities

🔢 Numbers & Math

• <math.h> — Common math
• <complex.h> — Complex numbers
• <tgmath.h> — Type-generic math
• <fenv.h> — Floating‐point environment
• <float.h> — Floating-point limits

🧵 Memory & Objects

• <stdlib.h> — Memory mgmt, conversions, qsort/bsearch, random
• <stddef.h> — Common macros & size_t
• <stdnoreturn.h> — noreturn

🔒 Concurrency & Atomics

• <threads.h> — Threads (C11)
• <stdatomic.h> — Atomics

🔤 Types, Limits & Bits

• <stdint.h> — Fixed-width integer types
• <inttypes.h> — Integer conversions/format macros
• <limits.h> — Ranges of integer types
• <stdbit.h> — Bit/byte utilities (C23)
• <stdckdint.h> — Checked integer arithmetic (C23)

⏳ Time & Locale

• <time.h> — Time/date utilities
• <locale.h> — Localization

⚡ Diagnostics & Errors

• <assert.h> — Runtime assertions
• <errno.h> — Error codes

🚦 Control Flow & Signals

• <setjmp.h> — Nonlocal jumps
• <signal.h> — Signal handling

🔄 Misc

• <stdarg.h> — Variadic functions
• <iso646.h> — Alternative operator spellings