The value of Exponential function can be calculated using Taylor Series.
= 1 + x/1! + /2! + /3! + ......
To find its value using recursion, we will use static variables. For the power of x we will use p and for factorials we will use f as static variables.
The function shown below is used to increase the power of x.
p = p*x
The function below is used to find factorials.
f = f*n
The function below is used to calculate the summation of the series.
where r is the recursive call to the function.
Below is the implementation of the above idea.
- Tail recursion to calculate sum of array elements.
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