The C + + Standard library provides 209 standard functions from the C library, as shown in Table 99:
Table 99—Standard Functions
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abort fmod isupper mktime strftime wcrtomb
abs fopen iswalnum modf strlen wcscat
acos fprintf iswalpha perror strncat wcschr
asctime fputc iswcntrl pow strncmp wcscmp
asin fputs iswctype printf strncpy wcscoll
atan fputwc iswdigit putc strpbrk wcscpy
atan2 fputws iswgraph putchar strrchr wcscspn
atexit fread iswlower puts strspn wcsftime
atof free iswprint putwc strstr wcslen
atoi freopen iswpunct putwchar strtod wcsncat
atol frexp iswspace qsort
strtok wcsncmp
bsearch fscanf iswupper raise strtol wcsncpy
btowc fseek iswxdigit rand strtoul wcspbrk
calloc fsetpos isxdigit realloc strxfrm wcsrchr
ceil ftell labs remove swprintf wcsrtombs
clearerr fwide ldexp rename swscanf wcsspn
clock fwprintf ldiv rewind system wcsstr
cos fwrite localeconv scanf tan wcstod
cosh fwscanf localtime setbuf tanh wcstok
ctime getc log setlocale time wcstol
difftime getchar log10 setvbuf tmpfile wcstombs
div getenv longjmp signal tmpnam wcstoul
exit gets malloc sin tolower wcsxfrm
exp getwc mblen sinh toupper wctob
fabs getwchar mbrlen sprintf towctrans wctomb
fclose gmtime mbrtowc sqrt towlower wctrans
feof isalnum mbsinit srand towupper wctype
ferror isalpha mbsrtowcs sscanf ungetc wmemchr
fflush iscntrl mbstowcs strcat ungetwc wmemcmp
fgetc isdigit mbtowc strchr vfprintf wmemcpy
fgetpos isgraph memchr strcmp vfwprintf wmemmove
fgets islower memcmp strcoll vprintf wmemset
fgetwc isprint memcpy strcpy vsprintf wprintf
fgetws ispunct memmove strcspn vswprintf wscanf
floor isspace memset strerror vwprintf _ __________________________________________________ ________________________