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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 AppendixData Conversion Routines
| Routine | Attributes | Description |
|---|---|---|
| abs | reentrant | Generates the absolute value of an integer type. |
| atof | Converts a string to a float. | |
| atoi | Converts a string to an int. | |
| atol | Converts a string to a long. | |
| labs | reentrant | Generates the absolute value of a long type. |
| strtod | Converts a string to a float. | |
| strtol | Converts a string to a long. | |
| strtoul | Converts a string to an unsigned long. |
The data conversion routines convert strings of ASCII characters to numbers. All of these routines are implemented as functions and most are prototyped in stdlib.h. The abs and labs functions are prototyped in math.h.
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