!Write a program that evaluates one of the following equations depending on
!the value of Z.
!
! If Z is 1
!   X = A + B
! Else if Z is 2
!   X = A*B
! Else
!   X = A*B + A + B
!
!Try your program with the following values:
!
! A = 0x0010
! B = 0x0022
! Z = 0x0002
!
!Also try your program with Z = 0x0001 and Z = 0x0003.
!

org: 0x0030
X:
0x0000		! Result X.
A:
0x0010		! A
B:
0x0022		! B
Z:
0x0002		! Z
zero:
0x0000
temp:
0x0000


org: 0x0000
load RI=[zero]          ! set index register to zero
load RA=[Z+RI]          ! load Z
dec			! Try Z = 1
load [temp+RI]=RC       ! save Z - 1
load RI=[temp]          ! load Z - 1 in RI to check for zero
jz ifOne		! if Z = 1 jump to A + B evaluation
load RI=[zero]          ! Reset RI to zero
load RA=[temp+RI]       ! load Z - 1
dec                     ! Try Z = 2
load [temp+RI]=RC       ! save Z - 2
load RI=[temp]          ! load Z - 2 in RI to check for zero
jz elseIfTwo		! else if Z = 2 jump to A*B evaluation
jmp else                ! else jump to A*B + A + B
ifOne:
  load RI=[zero]        ! set index register to zero
  load RA=[A+RI]	! Begin A + B.  Load A into RA
  load RB=[B+RI]	! load B into RB
  add			! add A and B
  load [X+RI]=RC	! save results
  jmp endIf		! jump to end
elseIfTwo:
  load RI=[zero]        ! set index register to zero
  load RA=[A+RI]	! Begin A*B.  Load A into RA
  load RB=[B+RI]	! load B into RB
  mult			! multiply A and B
  load [X+RI]=RC	! save results
  jmp endIf		! jump to end
else:
  load RI=[zero]        ! set index register to zero
  load RA=[A+RI]  	! Begin A*B + A + B.  Load A into RA
  load RB=[B+RI]  	! load B into RB
  mult			! multiply A and B
  mov RB=RC		! move A*B into RB
  add			! add A*B with A
  mov RB=RC		! move A*B + A into RB
  load RA=[B+RI]  	! load B into RA
  add			! add A*B + A with B
  load [X+RI]=RC  	! save results
endIf:
halt			! stop program