#
#	name "robot"
#
#
	.data
x:	.word	0:4	# x-coordinates of 4 robots
y:	.word	0:4	# y-coordinates of 4 robots

str1:	.asciiz	"Your coordinates: 25 25\n"
str2:	.asciiz	"Enter move (1 for +x, -1 for -x, 2 for + y, -2 for -y):"
str3:	.asciiz	"Your coordinates: "
sp:	.asciiz	" "
endl:	.asciiz	"\n"
str4:	.asciiz	"Robot at "
str5:	.asciiz	"AAAARRRRGHHHHH... Game over\n"

#i	$s0
#myX	$s1
#myY	$s2
#move	$s3
#status	$s4
#temp,pointers	$s5,$s6
	.text
#	.globl	inc
#	.globl	getNew

main:	li	$s1,25		#  myX = 25
	li	$s2,25		#  myY = 25
	li	$s4,1		#  status = 1

	la	$s5,x
	la	$s6,y

	sw	$0,($s5)	#  x[0] = 0; y[0] = 0;
	sw	$0,($s6)
	sw	$0,4($s5)	#  x[1] = 0; y[1] = 50;
	li	$s7,50
	sw	$s7,4($s6)
	sw	$s7,8($s5)	#  x[2] = 50; y[2] = 0;
	sw	$0,8($s6)
	sw	$s7,12($s5)	#  x[3] = 50; y[3] = 50;
	sw	$s7,12($s6)

	la	$a0,str1	#  cout << "Your coordinates: 25 25\n";
	li	$v0,4
	syscall

	bne	$s4,1,main_exitw	#  while (status == 1) {
main_while:
	la	$a0,str2	#    cout << "Enter move (1 for +x,
	li	$v0,4		#	-1 for -x, 2 for + y, -2 for -y):";
	syscall

	li	$v0,5		#    cin >> move;
	syscall
	move	$s3,$v0

	bne	$s3,1,main_else1#    if (move == 1)
	add	$s1,$s1,1	#      myX++;
	b	main_exitif
main_else1:
	bne	$s3,-1,main_else2	#    else if (move == -1)
	add	$s1,$s1,-1	#      myX--;
	b	main_exitif
main_else2:
	bne	$s3,2,main_else3	#    else if (move == 2)
	add	$s2,$s2,1	#      myY++;
	b	main_exitif
main_else3:	bne	$s3,-2,main_exitif	#    else if (move == -2)
	add	$s2,$s2,-1	#      myY--;

main_exitif:	la	$a0,x		#    status = moveRobots(&x[0],&y[0],myX,myY);
	la	$a1,y
	move	$a2,$s1
	move	$a3,$s2
	jal	moveRobots
	move	$s4,$v0

	la	$a0,str3	#    cout << "Your coordinates: " << myX
	li	$v0,4		#      << " " << myY << endl;
	syscall
	move	$a0,$s1
	li	$v0,1
	syscall
	la	$a0,sp
	li	$v0,4
	syscall
	move	$a0,$s2
	li	$v0,1
	syscall
	la	$a0,endl
	li	$v0,4
	syscall

	la	$s5,x
	la	$s6,y
	li	$s0,0		#    for (i=0;i<4;i++)
main_for:	la	$a0,str4	#      cout << "Robot at " << x[i] << " "
	li	$v0,4		#           << y[i] << endl;
	syscall
	lw	$a0,($s5)
	li	$v0,1
	syscall
	la	$a0,sp
	li	$v0,4
	syscall
	lw	$a0,($s6)
	li	$v0,1
	syscall
	la	$a0,endl
	li	$v0,4
	syscall
	add	$s5,$s5,4
	add	$s6,$s6,4
	add	$s0,$s0,1
	blt	$s0,4,main_for

	beq	$s4,1,main_while
				#  }
main_exitw:	la	$a0,str5	#  cout << "AAAARRRRGHHHHH... Game over\n";
	li	$v0,4
	syscall
	li	$v0,10		#}
	syscall

	#	int moveRobots(int *arg0, int *arg1, int arg2, int arg3)
	#
	#	arg0	$a0	base address of array of x-coordinates
	#	arg1	$a1	base address of array of y-coordinates
	#	arg2	$a2	x-coordinate of human (copy in $s2)
	#	arg3	$a3	y-coordinate of human (copy in $s3)
	#	ptrX	$s0
	#	ptrY	$s1
	#	i	$s4
	#	alive	$s5
	#	temp	$s6
	#
	#	moveRobots() calls getNew() to obtain the new coordinates
	#	of each robot. The position of each robot is updated.

	moveRobots:










					#  alive = 1;
			
			

			        	#  ptrX = arg0;
			       	#  ptrY = arg1;

		li	$s4,0
					#  for (i=0;i<4;i++) {
	loop:				#    *ptrX = getNew(*ptrX,arg2);
		
			
		
					#    *ptrY = getNew(*ptrY,arg3);
			
		
		

					#    if ((*ptrX == arg2) && (*ptrY == arg3)) {
		
		
		
				#      alive = 0;
				#      break;
					#    }
	inc:	add	$s0,$s0,4	#    ptrX++;
					#    ptrY++;
					#  }
		

	endfor:	move	$v0,$s5		#  return alive;

		
		
					#}

	#	int getNew(int arg0, int arg1)
	#
	#	arg0	$a0	one coordinate of robot
	#	arg1	$a1	one coordinate of human
	#	temp	$t0
	#	result	$v0
	#
	#	Returns new coordinate of robot. If the absolute difference between
	#	the robot coordinate and human coordinate is >=10, the robot
	#	coordinate moves 10 units closer to the human coordinate.
	#	If the absolute difference is < 10, the robot coordinate
	#	moves 1 unit closer to the human coordinate.

	getNew:				#{
		sub	$t0,$a0,$a1	#  temp = arg0 - arg1;
		blt	$t0,10,gelse1	#  if (temp >= 10)
		sub	$v0,$a0,10	#    result = arg0 - 10;
		j	exitgelse
	gelse1:	blez	$t0,gelse2	#  else if (temp > 0)
		sub	$v0,$a0,1	#    result = arg0 - 1;
		j	exitgelse
	gelse2:	bnez	$t0,gelse3	#  else if (temp == 0)
		move	$v0,$a0		#    result = arg0;
		j	exitgelse
	gelse3:	ble	$t0,-10,gelse4	#  else if (temp > -10)
		add	$v0,$a0,1	#    result = arg0 + 1;
		j	exitgelse
	gelse4:	bgt	$t0,-10,exitgelse
					#  else if (temp <= -10)
		add	$v0,$a0,10	#    result = arg0 + 10;
	exitgelse:
		jr	$31		#}