SPIM print example

# This program takes input from the user and echoes it back

.data
# Constant strings to be output to the terminal
promptInt: .asciiz "Please input an integer: "
resultInt: .asciiz "Next integer is: "
linefeed: .asciiz "\n"
enterkey: .asciiz "Press any key to end program."
.text
main:
# prompt for an integer
li $v0,4 # code for print_string
la $a0,promptInt # point $a0 to prompt string
syscall # print the prompt
# get an integer from the user
li $v0,5 # code for read_int
syscall #get int from user --> returned in $v0
move $t0,$v0 # move the resulting int to $t0
# compute the next integer
addi $t0, $t0, 1 # t0 <-- t0 + 1
# print out text for the result
li $v0,4 #code for print_string
la $a0,resultInt # point $a0 to result string
syscall # print the result string
# print out the result
li $v0,1 # code for print_int
move $a0,$t0 # put result in $a0
syscall # print out the result
# print out a line feed
li $v0,4 # code for print_string
la $a0,linefeed # point $a0 to linefeed string
syscall # print linefeed
# wait for the enter key to be pressed to end program
li $v0,4 # code for print_string
la $a0,enterkey # point $a0 to enterkey string
syscall # print enterkey
# wait for input by getting an integer from the user (integer is ignored)
li $v0,5 # code for read_int
syscall #get int from user --> returned in $v0
# All done, thank you!
li $v0,10 # code for exit
syscall # exit program