Write a program that accepts a numerical value x from 0 to 100 as input and cmputes and displays the corresponding letter grade given by the following table. A x >= 90 B 80<=x<=89 C 70<=x<=79 D 60<=x<=69 F x<60
a. Use nested if statement in your program(do not use eslseif)
b. Use only elseif clauses in your program.