Problem 1: Write a program that inputs a character and outputs whether or not it is in the alphabet or not.

Problem 2: Write a program that takes in 3 numbers and outputs the biggest number and the smallest number.

Problem 3: Write a program that enters 3 sides of a triangle checks whether the triangle is valid or not. Remember that a triangle is valid if and only if the sum of any two sides is greater than the third side.

Problem 4: Write a program to enter any alphabet and check whether alphabet is vowel or consonant using switch case.