5.9: Final Program to Prompt, Read, and Print an Integer

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The following program is the final result of this chapter. Make sure that the file utils.asm is in the same directory as the program Program5-9.asm. Bring Program5-9.asm into the edit window in MARS, assemble it, and run it.

Program 5-6: Final program to prompt for, read, and print an integer

# File:        Program5-9.asm
# Author:      Charles Kann
# Purpose:     To illustrate implementing and calling a subprogram named PrintNewLine.
.text
main:
    # read an input value from the user
    la $a0, prompt
    jal PromptInt
    move $s0, $v0
    
    # print the value back to the user
    jal PrintNewLine
    la $a0, result
    move $a1, $s0
    jal PrintInt
    
    # call the Exit subprogram to exit
    jal Exit
.data
    prompt: .asciiz "Please enter an integer: "
    result: .asciiz "You entered: "
.include "utils.asm"

Note that by using subprogram abstraction how much easier this program is to understand than the one at the start of the chapter. It is beginning to look like the HLL code most readers are already familiar with.