1) Write a program to calculate n!
2) ``Lucky 7'' is defined as when the addition of both dice 
    equals 7 in one throw.  A die [dice is plural] has 6 
    sides numbered 1-6.

    Write a program to count the number of throws it takes
    two dice to get 100 Lucky 7's.  [Hint: you must use
    the rand() function to simulate dice throws.]  
    
    Use the following headers:

    #include<iostream>
    #include<cstdlib>
    #include<ctime>


3) Next, write a program that will print the upper left corner of 
   numbers given a number by the user:


    Give me a number :> 10
   
    1 2 3 4 5 6 7 8 9 10 
    2 3 4 5 6 7 8 9 10 
    3 4 5 6 7 8 9 10 
    4 5 6 7 8 9 10 
    5 6 7 8 9 10 
    6 7 8 9 10 
    7 8 9 10 
    8 9 10 
    9 10 
    10 

Extra: Try to do the same with the other four corners and try to keep the
number's position:

Example:

1 2 3 4 5 6 7 8 9 10 
1 2 3 4 5 6 7 8 9 
1 2 3 4 5 6 7 8 
1 2 3 4 5 6 7 
1 2 3 4 5 6 
1 2 3 4 5 
1 2 3 4 
1 2 3 
1 2 
1 
1 2 3 4 5 6 7 8 9 10 
  2 3 4 5 6 7 8 9 10 
    3 4 5 6 7 8 9 10 
      4 5 6 7 8 9 10 
        5 6 7 8 9 10 
          6 7 8 9 10 
            7 8 9 10 
              8 9 10 
                9 10 
                  10 
                  10 
                9 10 
              8 9 10 
            7 8 9 10 
          6 7 8 9 10 
        5 6 7 8 9 10 
      4 5 6 7 8 9 10 
    3 4 5 6 7 8 9 10 
  2 3 4 5 6 7 8 9 10 
1 2 3 4 5 6 7 8 9 10 
1                   
1 2                 
1 2 3               
1 2 3 4             
1 2 3 4 5           
1 2 3 4 5 6         
1 2 3 4 5 6 7       
1 2 3 4 5 6 7 8     
1 2 3 4 5 6 7 8 9   
1 2 3 4 5 6 7 8 9 10