Epson S5U1C17001C, Руководство пользователя

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7-12
EPSOn
S5U1C17001C ManUal
(C COMPilEr PaCkagE fOr S1C17 faMily) (Ver. 1.5.0)
7 liBrary
Date and time functions
The table below lists the date and time functions included in
libc.a
.
Table 7.3.2.4 Date and time functions
Header file:
time.h
function functionality reentrant notes
struct tm * gmtime (time_t *t);
Convert calendar time to standard time. Nonreentrant Change static variable.
time_t mktime (struct tm *tmptr); Convert standard time to calendar time. Nonreentrant Locale information and daylight
savings time settings are not
applied.
time_t time (time_t *tptr); Return current calendar time. Conditional Refer to global variable
gm_sec
.
Mathematical functions
The table below lists the mathematical functions included in
libc.a
.
Table 7.3.2.5 Mathematical functions
Header files:
math.h
,
errno.h
,
float.h
,
limits.h
function functionality reentrant notes
double fabs (double x); Return absolute value (
double
type). Reentrant
double ceil (double x);
Round up
double
-type decimal part. Nonreentrant Change global variable
errno
,
destruct
ALR
and
AHR
.
double floor (double x); Round down
double
-type decimal
part.
Nonreentrant Change global variable
errno
,
destruct
ALR
and
AHR
.
double fmod (double x, double y); Calculate
double
-type remainder. Nonreentrant Change global variable
errno
,
destruct
ALR
and
AHR
.
double exp (double x); Exponentiate (e x ). Nonreentrant Change global variable
errno
,
destruct
ALR
and
AHR
.
double
log
(double x);
Calculate natural logarithm. Nonreentrant Change global variable
errno
,
destruct
ALR
and
AHR
.
double log10 (double x);
Calculate common logarithm. Nonreentrant Change global variable
errno
,
destruct
ALR
and
AHR
.
double frexp (double x, int *nptr); Return mantissa and exponent of
floating-point number. Nonreentrant Change global variable
errno
,
destruct
ALR
and
AHR
.
double ldexp (double x, int n); Return floating-point number from
mantissa and exponent. Nonreentrant Change global variable
errno
,
destruct
ALR
and
AHR
.
double
modf
(double x, double
*nptr);
Return integer and decimal parts of
floating-point number. Nonreentrant Change global variable
errno
,
destruct
ALR
and
AHR
.
double pow (double x, double y);
Calculate x y . Nonreentrant Change global variable
errno
,
destruct
ALR
and
AHR
.
double sqrt (double x); Calculate square root. Nonreentrant Change global variable
errno
,
destruct
ALR
and
AHR
.
double sin (double x); Calculate sine. Nonreentrant Change global variable
errno
,
destruct
ALR
and
AHR
.
double
cos
(double x);
Calculate cosine. Nonreentrant Change global variable
errno
,
destruct
ALR
and
AHR
.
double tan (double x);
Calculate tangent. Nonreentrant Change global variable
errno
,
destruct
ALR
and
AHR
.
double asin (double x); Calculate arcsine. Nonreentrant Change global variable
errno
,
destruct
ALR
and
AHR
.
double acos (double x); Calculate arccosine. Nonreentrant Change global variable
errno
,
destruct
ALR
and
AHR
.
double
atan
(double x);
Calculate arctangent. Nonreentrant Destruct
ALR
and
AHR
.
double atan2 (double y, double x); Calculate arctangent of y/x. Nonreentrant Change global variable
errno
,
destruct
ALR
and
AHR
.
double
sinh
(double x);
Calculate hyperbolic sine. Nonreentrant Change global variable
errno
,
destruct
ALR
and
AHR
.
double cosh (double x);
Calculate hyperbolic cosine. Nonreentrant Change global variable
errno
,
destruct
ALR
and
AHR
.
double tanh (double x); Calculate hyperbolic tangent. Nonreentrant Destruct
ALR
and
AHR
.