REVIEW.md

Review: Simply Having A Functional Christmas Time

Write a program that prints a "pine tree". This pine tree will consist of triangles of increasing sizes, drawn using with a user-inputted character (e.g. *, +, $, etc.). Your program must consist of the following three functions:

1. print_shifted_triangle(height, margin, symbol)
2. print_pine_tree(levels, symbol)
3. main()

---

print_shifted_triangle(height, margin, symbol)

This function will print a height-line triangle, filled with symbol characters, shifted to the right by a margin number of spaces. For example, check out the following function call and its respective expected output:

print_shifted_triangle(3, 4, '+')

       +
      +++
     +++++

_{Figure 1: A screenshot of what your output should look like if the line print_shifted_triangle(3, 4, '+') is run. Note that only the '+' characters should be visible. The dotted lines, arrows, and labels are only there for your clarity.}

print_pine_tree(levels, symbol)

This function will print a sequence of levels number of triangles of increasing sizes, forming a "pine tree". The triangles will be drawn using the symbol character. You must naturally make use of the print_shifted_triangle() function we wrote above. For example, check out the following function call and its respective expected output:

print_pine_tree(3, '#')

   #
  ###
   #
  ###
 #####
   #
  ###
 #####
#######

_{Figure 2: A screenshot of what your output should look like if the line print_pine_tree(3, '#') is run. Note, again, that only the '#' characters should be visible. The dotted lines, arrows, and labels are only there for your clarity.}

main()

This driver function will interact with the user and ask them to enter a valid character to use for our output, and a positive integer for the number of levels that our tree will have.

• Your program must continue asking the user to input a valid character in such case that they enter an invalid character, and for a non-zero positive integer in such case that the user enters zero or a negative number.
• Valid characters are limited to non-alphanumeric, non-whitespace characters. You may assume that the user will always enter integers and valid strings.

Enter a positive, non-zero, integer: 4
Enter a non-whitespace, non-alphanumeric character: /
    /
   ///
    /
   ///
  /////
    /
   ///
  /////
 ///////
    /
   ///
  /////
 ///////
/////////