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LETTERexpULETTER Exponential function.

Overview
#include <math.h>

r = exp(x);

double r; // e to the power of x
double x; // power

Portability
ANSI

Description
The "exp" function raises the natural logarithm base e to the x power. x does not necessarily need to be a whole number.

Returns
"exp" returns a double-precision floating-point number containing the calculated exponential.

See also
log

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

void main(void)
{
double result, x = 4.0;
result = exp(x);
printf("`e' raised to the power of %lf (e ^ %lf) = %lf\n,
x, x, result);
}