exp


function
     double exp (      double x );
      float exp (       float x );
long double exp ( long double x );

Compute exponential function

Returns the base-e exponential function of x, which is the e number raised to the power x.

In C++, this function is overloaded in <complex> and <valarray> (see complex exp and valarray exp).

Parameters

x
Floating point value.


Return Value

Exponential value of x.
If the the magnitude of the result is so large that it cannot be represented in an object of the return type, the function returns HUGE_VAL, and the value of the global variable errno is set to the ERANGE value.

Portability

In C, only the double version of this function exists with this name.

Example

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/* exp example */
#include <stdio.h>
#include <math.h>

int main ()
{
  double param, result;
  param = 5.0;
  result = exp (param);
  printf ("The exponential value of %lf is %lf.\n", param, result );
  return 0;
}


Output:

The exponential value of 5.000000 is 148.413159.


See also

log Compute natural logarithm (function)
pow Raise to power (function)