How do i get rid of "dropped off bottom" in my MARS compiler when I run this program?

Question

#program for inputting an integer and displaying it.

.data
    prompt:  .asciiz "Enter a number: "
    message: .asciiz "\nNumber entered is: "

.text
    li $v0, 4  #prompts the user to enter an integer.
    la $a0, prompt
    syscall


    li $v0, 5   # Reads in the integer
    syscall
    #Store the integer in $t0 since we need $v0 free
    move $t0,$v0

#Display message now.

    li $v0, 4
    la $a0, message     #prints the variable message.
    syscall

#Display the integer

    li $v0, 1
    move $a0,$t0        #move the contents of $t0 into the argument register.
    syscall

Answer 1

You just simply need to add a syscall 10 at the end

li $v0, 10
syscall

A syscall with 10 in the $v0 register tells the computer that the program is done. So in your case you would want to have something like

.data
    prompt:  .asciiz "Enter a number: "
    message: .asciiz "\nNumber entered is: "

.text
    li $v0, 4  #prompts the user to enter an integer.
    la $a0, prompt
    syscall


    li $v0, 5   # Reads in the integer
    syscall
    #Store the integer in $t0 since we need $v0 free
    move $t0,$v0

    li $v0, 4
    la $a0, message     #prints the variable message.
    syscall

    li $v0, 1
    move $a0,$t0        #move the contents of $t0 into the argument register.
    syscall

    li $v0, 10          # Signal end of program
    syscall

you can even just have it under a label like end. That way whenever you want to end the program you can branch to end and then finishing code will be executed

end:
    li $v0, 10
    syscall