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1.15 exp, expf—exponential

Synopsis 

     #include <math.h>
     double exp(double x);
     float expf(float x);

Description
exp and expf calculate the exponential of x, that is, e raised to the power x (where e is the base of the natural system of logarithms, approximately 2.71828).

You can use the (non-ANSI) function matherr to specify error handling for these functions.
Returns
On success, exp and expf return the calculated value. If the result underflows, the returned value is 0. If the result overflows, the returned value is HUGE_VAL. In either case, errno is set to ERANGE.
Portability
exp is ANSI C. expf is an extension.