1. Write a for loop that will display the letter 'X'   n number of times on a single line, where   n is an integer between 10 and 20.
2. Revise this code to repeat the output produced by #1   y times where   y is an integer between 4 and 10.
   
   For example, given   n = 15 and   y = 6, the following output will appear:
   
   
   XXXXXXXXXXXXXXX
   XXXXXXXXXXXXXXX
   XXXXXXXXXXXXXXX
   XXXXXXXXXXXXXXX
   XXXXXXXXXXXXXXX
   XXXXXXXXXXXXXXX
   
   
   
   
3. Suppose that you have two nested loops. The inner loop executes 5 times and the outer loop executes 10 times. How many total iterations are there within the nested loop structure?
   
   
   
4. Write a method left_align() that receives a positive integer n and produces the following output.
   
   n: 5
   X
   XX
   XXX
   XXXX
   XXXXX
   
   
   
   
5. Write a method right_align() that receives a positive integer n and produces the following output.
   
   n: 5
   OOOOX
   OOOXX
   OOXXX
   OXXXX
   XXXXX
   
   
   
   
   
   
6. Write a method tree() that receives a positive integer n and produces the following output.
   
   n: 4
   OOOXOOO
   OOXXXOO
   OXXXXXO
   XXXXXXX
   
   
   
   

Writing a Program