i) Go through the syntax of if-else statement and for loop.
ii) Develop a program to calculate sin x on input x. The input could be either in degrees or radians.
The format of input is: (for degree) d <int> or (for radians) r <float>.
Use the series
   sin x = x - x^3 / 3! + x^5 / 5! - x^7 / 7! + x^9 / 9! 
truncated after K terms. Read the value of K also from input.
iii) Generously comment your program, and emphasize their utility.