Write a program to examine exponential function:
We will write a program to examine the value of e and the exponential function. It will be a menu-driven. The menu options will be:
Print a description of e.
Prompt the user for a value of n, and then find an estimated value for e by using the expression (1 + 1/n)^{ n}
Prompt the user for value for x. Now print the value of exp(x) by using the built-in function. Find an approximate value for e^{x} by using the Maclaurin series just given.
Exit the program.