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C251 User's Guide
C251 Introduction Compiling Programs Language Extensions Preprocessor Advanced Programming Error Messages 
Library Reference Library Files 
Source Code Standard Types jmp_buf va_list Macros CBYTE CVAR CARRAY DARRAY DBYTE DVAR HARRAY HBYTE HVAR NARRAY NBYTE NVAR XARRAY XBYTE XVAR Routines by Category Buffer Manipulation Routines Character Routines Data Conversion Routines Intrinsic Routines Math Routines Memory Allocation Routines Stream I/O Routines String Routines Variable Length Argument Routines Miscellaneous Routines Include Files SFR Definitions absacc.h assert.h ctype.h float.h intrins.h limits.h math.h setjmp.h stdarg.h stddef.h stdio.h stdlib.h string.h Reference _chkdouble_ _chkfloat_ _crol_ _cror_ _getkey _irol_ _iror_ _lrol_ _lror_ _nop_ _testbit_ _tolower _toupper abs acos asin assert atan atan2 atof atoi atol cabs calloc ceil cos cosh exp fabs fcalloc ffree finit_mempool floor fmalloc fmemcpy fmemset frealloc free getchar gets hmemccpy hmemchr hmemcmp hmemcpy hmemmove hmemset hstrcmp hstrcpy hstrlen hstrncpy init_mempool isalnum isalpha iscntrl isdigit isgraph islower isprint ispunct isspace isupper isxdigit labs 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 tan tanh toascii toint tolower toupper ungetchar va_arg va_end va_start vprintf vsprintf xcalloc xfree xinit_mempool xmalloc xmemcpy xmemset xrealloc AppendixMath Routines
The math routines perform common mathematical calculations. Most of these routines work with floating-point values and include the floating-point libraries and support routines.
All of these routines are implemented as functions. Most are prototyped in the math.h include file. The rand and srand functions are prototyped in the stdlib.h include file.
The _chkfloat_, _crol_, _cror_, _irol_, _iror_, _lrol_, and _lror_ functions are prototyped in the intrins.h include file.
| Routine | Attributes | Description |
|---|---|---|
| acos | reentrant | Calculates the arc cosine of a specified number. |
| asin | reentrant | Calculates the arc sine of a specified number. |
| atan | reentrant | Calculates the arc tangent of a specified number. |
| atan2 | reentrant | Calculates the arc tangent of a fraction. |
| ceil | reentrant | Finds the integer ceiling of a specified number. |
| _chkdouble_ | intrinsic, reentrant | Checks the status of double precision numbers. |
| _chkfloat_ | intrinsic, reentrant | Checks the status of float numbers. |
| cos | reentrant | Calculates the cosine of a specified number. |
| cosh | reentrant | Calculates the hyperbolic cosine of a specified number. |
| _crol_ | intrinsic, reentrant | Rotates an unsigned char left a specified number of bits. |
| _cror_ | intrinsic, reentrant | Rotates an unsigned char right a specified number of bits. |
| exp | reentrant | Calculates the exponential function of a specified number. |
| fabs | reentrant | Finds the absolute value of a specified number. |
| floor | reentrant | Finds the largest integer less than or equal to a specified number. |
| _irol_ | intrinsic, reentrant | Rotates an unsigned int left a specified number of bits. |
| _iror_ | intrinsic, reentrant | Rotates an unsigned int right a specified number of bits. |
| log | reentrant | Calculates the natural logarithm of a specified number. |
| log10 | reentrant | Calculates the common logarithm of a specified number. |
| _irol_ | intrinsic, reentrant | Rotates an unsigned int left a specified number of bits. |
| _lror_ | intrinsic, reentrant | Rotates an unsigned int right a specified number of bits. |
| modf | reentrant | Generates integer and fractional components of a specified number. |
| pow | reentrant | Calculates a value raised to a power. |
| rand | reentrant | Generates a pseudo random number. |
| sin | reentrant | Calculates the sine of a specified number. |
| sinh | reentrant | Calculates the hyperbolic sine of a specified number. |
| sqrt | reentrant | Calculates the square root of a specified number. |
| srand | reentrant | Initializes the pseudo random number generator. |
| tan | reentrant | Calculates the tangent of a specified number. |
| tanh | reentrant | Calculates the hyperbolic tangent of a specified number. |
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