标准

文档：https://en.cppreference.com/w/c/header

标准与实现

标准：提出要求 实现：完成提出的要求

C语言的标准：

C89, C95, C99, C11, C17, C23

Linux下的glibc实现

常用的头文件和接口

• <assert.h> Conditionally compiled macro that compares its argument to zero
• <ctype.h> Functions to determine the type contained in character data
• <errno.h> Macros reporting error conditions
• <fenv.h> (C99) Floating-point environment
• <float.h> Limits of float types
• <inttypes.h> (C99) Format conversion of integer types
• <limits.h> Sizes of basic types
• <math.h> Common mathematics functions
• <signal.h> Signal handling
• <stdarg.h> Variable arguments
• <stdatomic.h> (C11) Atomic types
• <stdbool.h> (C99) Macros for boolean type
• <stddef.h> Common macro definitions
• <stdint.h> (C99) Fixed-width integer types
• <stdio.h> Input/output
• <stdlib.h> General utilities: memory management, program utilities, string conversions, random numbers
• <string.h> String handling
• <time.h> Time/date utilities