Create code to accept one subtraction, addition, or multiplication expression from the command line, perform the operation and display the result as in the samples below. $ spim -f code.s 11 + 12 23 $ spim -f code.s 22 - 12 I wanted how to go about reading and breaking up the command line input to do the operations. They give us the following code to modify.

# prompt the user to enter two integers, sum integers and display the result .text .globl read .globl main .ent main main: jal read li $v0,10 # 10 is exit system call syscall .end main read: # prompt for first integer li $v0 4 # 4 is print string la $a0, iprompt # load address of prompt into $a0 to print syscall # display the prompt # read the first integer li $v0 5 # setup syscall 5 (read_int) syscall # integer returned in $v0 move $t0, $v0 # move first integer to $t0 # prompt for second integer li $v0 4 # 4 is print string la $a0, iprompt # load address of prompt into $a0 to print syscall # display the prompt # read the second integer li $v0 5 # setup syscall 5 (read_int) syscall # integer returned in $v0 move $t1, $v0 # move first integer to $t1 # sum the two integers add $t2, $t0, $t1 move $a0,$t2 # move the result into register $a0 li $v0, 1 # setup syscall 1 (print_int) syscall # make the call to display the integer li $v0, 4 # print newline la $a0, newline syscall jr $ra .data iprompt: .asciiz "Enter an integer [return]: " newline: .asciiz " "