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exp, expf : exponential

Synopsis

Section titled “Synopsis”
#include <math.h>
double exp(double x);
float expf(float x);
```### Description


exp and expf calculate the exponential of x, that is, 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.


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**Authoritative source**: BUSMASTER DITA help source `exp.dita`, compiled into `BUSMASTER.CHM` with the application.