A program that calculates the value of arctan(x) or tan^{-1} (x) by representing arctan(x) as a power series. Note that the program cannot calculate values of x that aren't from the interval [-1, 1].
A program that takes the inputted number in any base-b, then it converts it to decimal (base-10)
A program that generates passords with specified length from the user. the password contains uppercase and lower case letters, symbols, numbers.
A program that calculate how many tiles your room will need, based on the room's and tile's dimensions.
If you are stuck between many option, this program will select randomly one of the choices.