Problem
A. Write a function that takes a number and a character (as parameters) and prints a triangle of that size using the specified character.
B. Write a function that takes the radius of a sphere as a parameter and returns its volume.
C. Write a function that takes a number as parameter and returns the factorial.
D. Write a function that takes an integer as parameter and returns the number of digits.
E. Write a function that takes an integer as parameter and returns the sum of digits.
F. Write a function that takes an integer as parameter and returns the reverse number.
G. Write a function that takes two numbers as parameters and returns their HCF.