NAME
exp, expf, expl - base-e exponential function SYNOPSIS
#include
double exp(double x); float expf(float x); long double expl(long double x); Link with -lm. Feature Test Macro Requirements for glibc (see featuretestmacros(7)): expf(), expl(): BSDSOURCE || SVIDSOURCE || XOPENSOURCE >= 600 || ISOC99SOURCE || POSIXCSOURCE >= 200112L;
or cc -std=c99 DESCRIPTION The exp() function returns the value of e (the base of natural loga‐ rithms) raised to the power of x. RETURN VALUE 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 +HUGEVAL, +HUGEVALF, or +HUGEVALL, respectively. ERRORS See matherror(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 (FEOVERFLOW) is raised. Range error, underflow
errno is set to ERANGE. An underflow floating-point exception (FEUNDERFLOW) is raised. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├────────────────────┼───────────────┼─────────┤
│exp(), expf(), │ Thread safety │ MT-Safe │ │expl() │ │ │ └────────────────────┴───────────────┴─────────┘ CONFORMING TO
C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89. SEE ALSO cbrt(3), cexp(3), exp10(3), exp2(3), sqrt(3) COLOPHON
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2010-09-20 EXP(3)