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Source Code Standard Types div_t jmp_buf ldiv_t ptrdiff_t size_t va_list wchar_t Routines By Category Buffer Manipulation Routines Character Routines Data Conversion Routines Math Routines Memory Allocation Routines Stream I/O Routines String Routines Variable Length Argument Routines Miscellaneous Routines Include Files SFR Definitions assert.h ctype.h float.h inttypes.h limits.h math.h setjmp.h stdarg.h stddef.h stdio.h stdlib.h string.h Reference _chkdouble_ _chkfloat_ _getkey _tolower _toupper abs acos asin assert atan atan2 atof atoi atol calloc ceil cos cosh div exp fabs floor fmod free getchar gets init_mempool isalnum isalpha iscntrl isdigit isgraph islower isprint ispunct isspace isupper isxdigit labs ldiv log log10 longjmp malloc memccpy memchr memcmp memcpy memmove memset modf offsetof pow printf putchar puts rand realloc scanf setjmp sin sinh sprintf sqrt srand sscanf strcat strchr strcmp strcpy strcspn strlen strncat strncmp strncpy strpbrk strpos strrchr strrpbrk strrpos strspn strtod strtol strtoul tan tanh toascii toint tolower toupper ungetchar va_arg va_end va_start vprintf vsprintf AppendixCharacter Routines
| Routine | Attributes | Description |
|---|---|---|
| isalnum | reentrant | Tests for an alphanumeric character. |
| isalpha | reentrant | Tests for an alphabetic character. |
| iscntrl | reentrant | Tests for a Control character. |
| isdigit | reentrant | Tests for a decimal digit. |
| isgraph | reentrant | Tests for a printable character with the exception of space. |
| islower | reentrant | Tests for a lowercase alphabetic character. |
| isprint | reentrant | Tests for a printable character. |
| ispunct | reentrant | Tests for a punctuation character. |
| isspace | reentrant | Tests for a whitespace character. |
| isupper | reentrant | Tests for an uppercase alphabetic character. |
| isxdigit | reentrant | Tests for a hexadecimal digit. |
| toascii | reentrant | Converts a character to an ASCII code. |
| toint | reentrant | Converts a hexadecimal digit to a decimal value. |
| tolower | reentrant | Tests a character and converts it to lowercase if it is uppercase. |
| _tolower | reentrant | Unconditionally converts a character to lowercase. |
| toupper | reentrant | Tests a character and converts it to uppercase if it is lowercase. |
| _toupper | reentrant | Unconditionally converts a character to uppercase. |
The character routines allow you to test individual characters for a variety of attributes and convert characters to different formats.
The _tolower, _toupper, and toascii routines are implemented as macros. All other routines are implemented as functions. All macro definitions and function prototypes are found in the ctype.h include file.
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