### exp -- Calculate Exponential Function

Format

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

Language Level: ANSI, POSIX, XPG4
exp calculates the exponential function of a floating-point argument x (e(x), where e equals 2.17128128...).

Return Value
If an overflow occurs, exp returns HUGE_VAL. If an underflow occurs, it returns 0. Both overflow and underflow set errno to ERANGE.

Example
This example calculates y as the exponential function of x:

    #include <math.h>
    #include <stdio.h>

    int main(void)
    {
       double x, y;

       x = 5.0;
       y = exp(x);

       printf("exp( %lf ) = %lf\n", x, y);

       /***************************************
          The output should be:

          exp( 5.000000 ) = 148.413159
       ***************************************/
    }

log -- Calculate Natural Logarithm
log10 -- Calculate Base 10 Logarithm
<math.h>