exp, expl

raw OCR

Calculates the exponential e to the x.

Defined in header <math.h>

Syntax

Real versions:                          Complex version:
#include <math.h>                       #include <complex.h>
double exp(double x);                   complex exp(complex  x);
long double expKlong double x);

Portability

	DOS	UNIX	Windows	ANSI C	C++ only
expl	■		■
Real exp	■	■	■	■
Complex exp	■		■		■

Remarks

exp calculates the exponential function e^.

expl is the long double version; it takes a long double argument and returns a long double result.

The complex exponential function is defined by

exp(x + y 0 = exp(x) (cos(i/) + i sin(i/))

Return value

exp returns e^.

Sometimes the arguments passed to these functions produce results that overflow or are incalculable. When the correct value overflows, exp

returns the value HUGE_VAL	and expl returns _LHUGE_VAL.	Results of

excessively large magnitude will cause the global variable errno to be set to

ERANGE Result out of range On underflow, these functions return 0.0, and the global variable errno is

not changed.

Error handling for these functions can be modified through the functions matherr and _matherrl.

Example

#include <stdio.h>
#include <math.h>
int main(void)

   double result, x = 4.0;
   result - exp(x);
   printfC'e'  raised to the power  of %lf (e   *If)   %lf\n", X, X, result) ;
   return 0;

Differences from modern implementations

Nothing recorded yet.

Modern references

These are search links, not yet checked by hand.

Stable link: /3.1/math.h/exp/ · short form /3.1/exp/