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Showing content from https://cplusplus.com/reference/cmath/exp/ below:

function

exp

     double exp  (double x);      float expf (float x);long double expl (long double x);

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

     double exp (double x);      float exp (float x);long double exp (long double x);     double exp (T x);           // additional overloads for integral types

Compute exponential function

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

Header

<tgmath.h>

provides a type-generic macro version of this function.

Parameters

x: Value of the exponent.

Return Value Exponential value of x.
If the magnitude of the result is too large to be represented by a value of the return type, the function returns HUGE_VAL (or HUGE_VALF or HUGE_VALL) with the proper sign, and an overflow range error occurs:

If an overflow

range error

occurs, the global variable

errno

is set to

ERANGE

Example

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

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

Output:

The exponential value of 5.000000 is 148.413159.