#**********************************************************************
#   CS 232: Computer Architecture I
#
#   Written:   3/9/97, Rimli Sengupta
#   Modified:  8/12/00, JP Mellor       
#
#   This file contains procedure:
#     -- main
#   
#   The program prompts the user for an integer i and prints
#   out the i-th element of an array in memory
#
#**********************************************************************

	.globl	main
	.globl	V

	.data

V:	.word   20, 56, -90, 37, -2, 30, 10, -66, -4, 18
prompt:	.asciiz "Enter an integer (0-9) -> "
newline:	.asciiz "\n"

#**********************************************************************

	.text

main:	

#----------------------------------------------------------------------
#       Prompt for input 
#----------------------------------------------------------------------

	li	$v0, 4		# use system call for printing a string
	la	$a0, prompt	# load address of string to print in $a0
	syscall
        
#----------------------------------------------------------------------
#       Read input i
#----------------------------------------------------------------------

	li	$v0, 5		# use system call for reading
	syscall			# an integer i.
	move	$t0, $v0	# Copy integer i into $t0.

#----------------------------------------------------------------------
#       Access and print V(i)
#----------------------------------------------------------------------

	sll	$t0, $t0, 2	# $t0 := 4 * $t0

	lw	$a0, V($t0)	# read V(i) into $a0 
	li	$v0, 1		# use system call to
	syscall			# print the integer V(i)

	la	$a0, newline	# print a new line
	li	$v0, 4
	syscall

# ---------------------------------------------------------------------
#   Exit 
# ---------------------------------------------------------------------

	li	$v0, 10
	syscall