# A demonstration of some simple MIPS instructions
# used to test QtSPIM
        
        # Declare main as a global function
        .globl main
        # All memory structures are placed after the
        # .data assembler directive
        .data
        # The .word assembler directive reserves space
value:  .word 12
msg:	.asciiz	"Hello CENG3420!\n"
        
        # All program code is placed after the
        # .text assembler directive
        # The label ’main’ represents the starting point
        .text
main:
        li $t2, 25        # Load immediate value (25)  
        lw $t3, value     # Load the word stored at label ’value’
        add $t4, $t2, $t3 # Add
        sub $t5, $t2, $t3 # Subtract
        la $a0, msg	      # Pointer to string
        li $v0, 4         # to use print_string syscall
        syscall
        
        # Exit the program by means of a syscall.
        # There are many syscalls - pick the desired one
        # by placing its code in $v0. The code for exit is "10"
        li $v0, 10 # Sets $v0 to "10" to select exit syscall
        syscall # Exit