cs1311
                                  spring 2001                  
				  100.0 points


                        due 09:00:00 AM  Feb 2, 2001                 


   Please make sure that ALL essays, short answers, definitions, and
   explanations are in your own words.  NO credit will be given for
   answers taken directly from the book, lecture notes, etc...

   Turn in this assignment electronically using WebWork

   NOTE: You may use any module/data type declarations
         from a previous problem from the same assignment when 
	 answering questions.



[p1]
15.0 points

Consider the following algorithm and report the exact output that will 
be printed:

algorithm ABC_twist
	fred isoftype Num
	fred <- 3

	wilma isoftype Num
	wilma <- 3

	bambam isoftype Num
	bambam <- Change( fred, wilma )
	print( "fred = ", fred, "; wilma = ", wilma, "; bambam = ", bambam )

	untie( fred, wilma, bambam )
	print( "fred = ", fred, "; wilma = ", wilma, "; bambam = ", bambam )

	untie( fred, wilma, bambam )
	print( "fred = ", fred, "; wilma = ", wilma, "; bambam = ", bambam )

endalgorithm // ABC_twist

function Change returnsa Num ( x, y isoftype in Num )
	if( x > y ) then
		CHange returns (y - x)
	else
		Change returns (x * y)
	endif	
endfunction // Change

procedure untie( n1, n2 isoftype in/out Num, n3 isoftype in Num )
	n3 <- n3 / 3
	n1 <- n1 - n2
	n2 <- n1 + n3
	print( "n1 = ", n1, "; n2 = ", n2, "; n3 = ", n3 )
endprocedure // untie


[p2]
15.0 points

Write a recursive module that will take in a number N and return the
sum of all the odd numbers between N and 0 (inclusively).  

You may assume that N is non-negative, and that the MOD function 
exists.

[p3]
15.0 points

Write a recursive module that will take in a number and print out the
even digits in reverse order.  You may assume that the number passed 
in is a positive integer.

For example, if the number 56493 is passed to your module, the even
numbers from left to right are 6 and 4, so 46 should be displayed 
to the screen.

[p4]
10.0 points

Declare a record called Statistics which will hold the following 
information:

	- Player Name
	- Innings pitched
	- Runs allowed
	- Unearned runs allowed
	- Whether the player is eligible to be included in the 
	  statistics analysis

[p5]
15.0 points

Create a module that will fill in a Statistics record as defined in p4.  
You should prompt the user for each entry and read the answer from 
the keyboard. 

The module should return the filled in Statistics record to the calling
algorithm or module.  Do not prompt the user for eligbility.  This 
should be true if the player has pitched more than 20 innings.

[p6]
10.0 points

Create a module that will take in a Statistics record defined in p4 
and compute a player's earned run average (ERA) where ERA is computed 
as (runs - unearned) * 9 / innings 

HINT: - what would cause this module to give an error?
      - what should it then return?

[p7]
10.0 points

Write a module that will take in a Statistics record and print out 
the information in the following form as long as it is eligible:

         Player: AAAAAAAAAA
        Innings: XX
    Earned Runs: XX
            ERA: XX

[p8]
10.0 points

Write an algorithm that will use the procedures above to acquire and 
store the data about three players, and then print out their statistics
if eligible.