Add extra credit input

prj1.asm

@@ -7,23 +7,33 @@
 
 # The label 'main' represents the starting point
 main:
+  # print user input
+  li $v0, 4
+  la $a0, enter_num
+  syscall
+
+  # get input from user and set argument
+  li $v0, 5
+  syscall
+  move $a1, $v0
+
 	la $a0, arr	         # $a0 based address of array
-	li $a1, 1	           # $a1 number to be found (checked) - change the value (7) to test
+  #li $a1, 1	           # $a1 number to be found (checked) - change the value (7) to test
 	li $a2, 6	           # $a2 max array index to be checked - change the value (3) to test
   li $s0, 0            # set counter to 0
   jal lookup           # hop to lookup function
+
+  # print newline
+  #li $v0, 4
+  #la $a0, newline
+  #syscall
+
   # print out result
   li $v0, 1     # print_int syscall code = 1
   move $a0, $s0 # load integer into $ao
   syscall
   j exit               # exit out of program
 
-# lookup (int arr[], int num, int cnt).
-# arr[] = 5 2 1 4 6 3
-# 1. lookup (arr, 5, 3) -> 0 (the index of ‘5’ in the array)
-# 2. lookup (arr, 1, 3) -> 2 (the index of ‘1’ in the array)
-# 3. lookup (arr, 7, 6) -> -1 (‘7’ is not found in the array)
-# 4. lookup (arr, 4, 3) -> -1 (the last parameter indicates to check only first 3 values in the
 lookup:
   addi $t0, $a2, 1     # store one higher value
 
@@ -57,7 +67,7 @@ exit:
 # .data assembler directive
 .data
 arr:		.word 5, 2, 1, 4, 6, 3		# change array to test
-#arr:		.word 5, 2, 1, 4, 6, 3		# change array to test
+enter_num: .asciiz "Enter number to be found: "
+newline: .asciiz "\n"
 str_found:	.asciiz	"found"
 str_not_found:	.asciiz	"not_found"
-nl: .asciiz "\n"