Write a complete MIPS program that prompts the user for two integer (in a subrou

Question

Write a complete MIPS program that prompts the user for two integer (in a subroutine - call it twice), calculates the product of the integers (also in a subroutine) and prints the product with simple descriptive text (also in a subroutine). You will have three little subroutines. Use the "simple linkage convention" (no stack use, use appropriate registers for arguments and return values). Do not worry about branch delays. Some syscall codes you may need are: print string, code 4 in $v0, string address in $a0; read integer, code 5, value returned in $v0; print integer, code 1, value in $a0; end program, code 10.

Explanation / Answer

CODE: (Explanation in comments)

.data

numbers: .space 8 # set aside 8 bytes for 2 integers

result: .space 4 # set aside 4 bytes for result

prompt: .asciiz "Enter a number "

prompt2: .asciiz "The result is "

.globl main

.text

main:

li $t0, 0 # set offset to 0

jal getnum # call function to read integer

addi $t0, $t0, 4 # increment offset to next word

jal getnum # call function to read integer

jal product # call function to calculate product

jal print # call print function

li $v0, 10 # set command to exit

syscall # end program

getnum:

li $v0, 4 # set command to print string

la $a0, prompt # load address of string

syscall # print string

li $v0, 5 # set command to read integer

syscall # prompt user to read integer

sw $v0, numbers($t0) # store read value in numbers location with offset $t0

jr $ra # return from call

print:

li $v0, 4 # set command to print string

la $a0, prompt2 # load address of string

syscall # print string

li $v0, 1 # set command to print product

lw $a0, result # load product into $a0

syscall # print the product

jr $ra # return from call

product:

lw $t0, numbers+0 # load num1 into register $t0

lw $t1, numbers+4 # load num2 into register $t1

mul $t2, $t0, $t1 # calculate their product in register $t2

sw $t2, result # store the product in result

jr $ra # return from call

OUTPUT:

Enter a number 5
Enter a number 6
The result is 30
-- program is finished running --

Enter a number 9
Enter a number 20
The result is 180
-- program is finished running --

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