.data
table:  
        # Complete the table as specified in the lab. The null character has
        # been set for you.  (ASCII values range from 0 to 127 base 10.)
        
        .byte 1,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3
        .byte 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3
        .byte 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3
        .byte 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3
        .byte 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3
        .byte 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3
        .byte 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3
        .byte 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3
        

line:   .byte   0:80    # up to an 80-character input line
prompt: .asciiz "Please type a line with fewer than 80 characters."
not_found_msg:
        .asciiz "Line was all whitespace."
alphnum_msg:
        .asciiz "First nonwhitespace character is alphanumeric: "
other_msg:
        .asciiz "First nonwhitespace character is not alphanumeric: "

        .text
main:
        la      $a0,prompt      # Print the prompt
        jal     puts
        li      $a0,0x0A        # And a newline
        jal     putc

        la      $a0,line        # read a line
        li      $a1,80
        jal     gets

        la      $s1,line
        la      $s2,table

# The scan code takes a pointer to a character in $s1
# and the address of a translation table in $s2.  It increments $s1
# to point to the first subsequent character whose table entry is nonzero,
# and stores the corresponding table value in $v0.

scan:
        # Your scan code from part B of exercise 1 goes here
        # please take note of the comments immediately before
        # the scan label. Jump/Branch to scan_done when your
        # loop terminates.


scan_done:
        li      $t0,1
        bne     $t0,$v0,nws_found

        la      $a0,not_found_msg # Print not found message
        jal     puts
        li      $a0,0x0A          # And newline
        jal     putc
        j	exit             # Return from main


nws_found:                      # scan hit a nonwhitespace character
        li      $t0,2
        bne     $t0,$v0,other_found

        la      $a0,alphnum_msg # scan hit an alphanumeric character
        jal     puts
        lbu     $a0,0($s1)      # Mention which one
        jal     putc
        li      $a0,0x0A        # And newline
        jal     putc
        j	exit             # Return from main


other_found:                    # scan hit a nonalphanumeric character
        la      $a0,other_msg   # Print message
        jal     puts
        lbu     $a0,0($s1)      # Mention which one
        jal     putc
        li      $a0,0x0A        # And newline
        jal     putc
        j	exit             # Return from main

putc:
	addi	$sp,$sp,-4
	sw	$ra,0($sp)	# just in case syscall screws up $ra
	li	$v0,11		# syscall code for printing a character
	syscall
	lw	$ra,0($sp)
	addi	$sp,$sp,4
	jr	$ra

puts:
	addi	$sp,$sp,-4
	sw	$ra,0($sp)	# just in case syscall screws up $ra
	li	$v0,4		# syscall code for printing a character
	syscall
	lw	$ra,0($sp)
	addi	$sp,$sp,4
	jr	$ra
	
gets:
	addi	$sp,$sp,-4
	sw	$ra,0($sp)	# just in case syscall screws up $ra
	li	$v0,8		# syscall code for printing a character
	syscall
	lw	$ra,0($sp)
	addi	$sp,$sp,4
	jr	$ra

exit:
	li	$v0,10
	syscall