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>