C 库宏 - assert() isalnum() isalpha() iscntrl() isdigit() isgraph()
islower() isprint() ispunct() isspace() isupper() isxdigit()
tolower() toupper() errno EDOM ERANGE setlocale
localeconv acos asin atan atan2 cos
cosh sin sinh tanh exp frexp
ldexp log log10 modf pow sqrt
ceil fabs floor fmod setjmp longjmp
signal raise va_start va_arg va_end NULL
offsetof fclose clearerr feof ferror fflush
fgetpos fopen fread freopen fseek fsetpos
ftell fwrite remove rename rewind setbuf
setvbuf tmpfile tmpnam fprintf printf sprintf
vfprintf vprintf vsprintf fscanf scanf sscanf
fgetc fgets fputc fputs getc getchar
gets putc putchar puts ungetc perror
atof atoi atol strtod strtol strtoul
calloc free malloc realloc abort atexit
exit getenv system bsearch qsort abs
div labs ldiv rand srand mblen
mbstowcs mbtowc wcstombs wctomb memchr memcmp
memcpy memmove memset strcat strncat strchr
strcmp strncmp strcoll strcpy strncpy strcspn
strerror strlen strpbrk strrchr strspn strstr
strok strxfrm asctime clock ctime difftime
gmtime localtime mktime strftime time