不错的C语言的Reference

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http://www.acm.uiuc.edu/webmonkeys/book/c_guide/
The C Library Reference Guide

by Eric Huss
© Copyright 1997 Eric Huss

Release 1
Introduction1.   Language     1.1  Characters          1.1.1     Trigraph Characters          1.1.2     Escape Sequences          1.1.3     Comments     1.2  Identifiers          1.2.1     Keywords          1.2.2     Variables          1.2.3     Enumerated Tags          1.2.4     Arrays          1.2.5     Structures and Unions          1.2.6     Constants          1.2.7     Strings          1.2.8     sizeof Keyword     1.3  Functions          1.3.1     Definition          1.3.2     Program Startup     1.4  References          1.4.1     Pointers and the Address Operator          1.4.2     Typecasting     1.5  Operators          1.5.1     Postfix          1.5.2     Unary and Prefix          1.5.3     Normal          1.5.4     Boolean          1.5.5     Assignment          1.5.6     Precedence     1.6  Statements          1.6.1     if          1.6.2     switch          1.6.3     while            1.6.4     do          1.6.5     for          1.6.6     goto          1.6.7     continue          1.6.8     break          1.6.9     return     1.7  Preprocessing Directives          1.7.1     #if, #elif, #else, #endif          1.7.2     #define, #undef, #ifdef, #ifndef          1.7.3     #include          1.7.4     #line          1.7.5     #error          1.7.6     #pragma          1.7.7     Predefined Macros2.   Library     2.1  assert.h          2.1.1     assert     2.2  ctype.h          2.2.1     is... Functions          2.2.2     to... Functions     2.3  errno.h           2.3.1     EDOM          2.3.2     ERANGE          2.3.3     errno        2.4  float.h          2.4.1     Defined Values     2.5  limits.h          2.5.1     Defined Values     2.6  locale.h          2.6.1     Variables and Definitions          2.6.2     setlocale          2.6.3     localeconv     2.7  math.h          2.7.1     Error Conditions          2.7.2     Trigonometric Functions               2.7.2.1   acos               2.7.2.2   asin               2.7.2.3   atan               2.7.2.4   atan2               2.7.2.5   cos               2.7.2.6   cosh               2.7.2.7   sin               2.7.2.8   sinh               2.7.2.9   tan               2.7.2.10  tanh          2.7.3     Exponential, Logarithmic, and Power Functions               2.7.3.1   exp               2.7.3.2   frexp               2.7.3.3   ldexp               2.7.3.4   log               2.7.3.5   log10               2.7.3.6   modf               2.7.3.7   pow               2.7.3.8   sqrt          2.7.4     Other Math Functions               2.7.4.1   ceil               2.7.4.2   fabs               2.7.4.3   floor               2.7.4.4   fmod     2.8  setjmp.h          2.8.1     Variables and Definitions          2.8.2     setjmp          2.8.3     longjmp     2.9  signal.h          2.9.1     Variables and Definitions          2.9.2     signal          2.9.3     raise     2.10 stdarg.h          2.10.1    Variables and Definitions          2.10.2    va_start          2.10.3    va_arg          2.10.4    va_end     2.11 stddef.h          2.11.1    Variables and Definitions     2.12 stdio.h          2.12.1    Variables and Definitions          2.12.2    Streams and Files          2.12.3    File Functions               2.12.3.1  clearerr               2.12.3.2  fclose               2.12.3.3  feof               2.12.3.4  ferror               2.12.3.5  fflush               2.12.3.6  fgetpos               2.12.3.7  fopen               2.12.3.8  fread               2.12.3.9  freopen               2.12.3.10 fseek               2.12.3.11 fsetpos               2.12.3.12 ftell               2.12.3.13 fwrite               2.12.3.14 remove               2.12.3.15 rename               2.12.3.16 rewind               2.12.3.17 setbuf               2.12.3.18 setvbuf               2.12.3.19 tmpfile               2.12.3.20 tmpnam          2.12.4    Formatted I/O Functions               2.12.4.1  ...printf Functions               2.12.4.2  ...scanf Functions          2.12.5    Character I/O Functions               2.12.5.1  fgetc               2.12.5.2  fgets               2.12.5.3  fputc               2.12.5.4  fputs               2.12.5.5  getc               2.12.5.6  getchar               2.12.5.7  gets               2.12.5.8  putc               2.12.5.9  putchar               2.12.5.10 puts               2.12.5.11 ungetc          2.12.7    Error Functions               2.12.7.1  perror     2.13 stdlib.h          2.13.1    Variables and Definitions          2.13.2    String Functions               2.13.2.1  atof               2.13.2.2  atoi               2.13.2.3  atol               2.13.2.4  strtod               2.13.2.5  strtol               2.13.2.6  strtoul          2.13.3    Memory Functions               2.13.3.1  calloc               2.13.3.2  free               2.13.3.3  malloc               2.13.3.4  realloc          2.13.4    Environment Functions               2.13.4.1  abort               2.13.4.2  atexit               2.13.4.3  exit               2.13.4.4  getenv               2.13.4.5  system          2.13.5    Searching and Sorting Functions               2.13.5.1  bsearch               2.13.5.2  qsort          2.13.6    Math Functions                 2.13.6.1  abs               2.13.6.2  div               2.13.6.3  labs               2.13.6.4  ldiv               2.13.6.5  rand               2.13.6.6  srand          2.13.7    Multibyte Functions               2.13.7.1  mblen               2.13.7.2  mbstowcs               2.13.7.3  mbtowc               2.13.7.4  wcstombs               2.13.7.5  wctomb     2.14 string.h          2.14.1    Variables and Definitions          2.14.2    memchr          2.14.3    memcmp          2.14.4    memcpy          2.14.5    memmove          2.14.6    memset          2.14.7    strcat          2.14.8    strncat          2.14.9    strchr          2.14.10   strcmp          2.14.11   strncmp          2.14.12   strcoll          2.14.13   strcpy          2.14.14   strncpy          2.14.15   strcspn          2.14.16   strerror          2.14.17   strlen          2.14.18   strpbrk          2.14.19   strrchr          2.14.20   strspn          2.14.21   strstr          2.14.22   strtok          2.14.23   strxfrm     2.15 time.h           2.15.1    Variables and Definitions          2.15.2    asctime          2.15.3    clock          2.15.4    ctime          2.15.5    difftime          2.15.6    gmtime          2.15.7    localtime          2.15.8    mktime          2.15.9    strftime          2.15.10   timeAppendix AASCII ChartIndexIndex
Questions, comments, or error reports? Please send them toEric Huss