|EXP(3)||Linux Programmer's Manual||EXP(3)|
NAMEexp, expf, expl - base-e exponential function
double exp(double x );
float expf(float x );
long double expl(long double x );
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;or cc -std=c99
DESCRIPTIONThe exp() function returns the value of e (the base of natural logarithms) raised to the power of x.
RETURN VALUEOn success, these functions return the exponential value of x.
ERRORSSee math_error(7) for information on how to determine whether an error has occurred when calling these functions.
- Range error, overflow
- errno is set to ERANGE. An overflow floating-point exception ( FE_OVERFLOW) is raised.
- Range error, underflow
- errno is set to ERANGE. An underflow floating-point exception ( FE_UNDERFLOW) is raised.
CONFORMING TOC99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.
SEE ALSOcbrt(3), cexp(3), exp10(3), exp2(3), sqrt(3)
COLOPHONThis page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.