exp, expf, expl - base-e exponential function
#include <math.h> double exp(double x); float expf(float x); long double expl(long double x); Link with -lm. Feature Test Macro Requirements for glibc (see feature_test_macros(7)): expf(), expl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
These functions return the value of e (the base of natural logarithms) raised to the power of x.
On success, these functions return the exponential value of x. If x is a NaN, a NaN is returned. If x is positive infinity, positive infinity is returned. If x is negative infinity, +0 is returned. If the result underflows, a range error occurs, and zero is returned. If the result overflows, a range error occurs, and the functions return +HUGE_VAL, +HUGE_VALF, or +HUGE_VALL, respectively.
See math_error(7) for information on how to determine whether an error has occurred when calling these functions. The following errors can occur: 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.
For an explanation of the terms used in this section, see attributes(7). Interface Attribute Value exp(), expf(), expl() Thread safety MT-Safe
C99, POSIX.1-2001, POSIX.1-2008. The variant returning double also conforms to SVr4, 4.3BSD, C89.
This page is part of release 4.09 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. 2016-03-15 EXP(3)
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