Write a MIPS assembly language program that reads how many T-shirts a customer w

Question

Write a MIPS assembly language program that reads how many T-shirts a customer wants to purchase.
If a customer enters 0 or a negative integer,
then the program should print out "Please enter a positive integer. ", and exit.
Otherwise, if a customer orders less than 10 T-shirts, then since each T-shirt costs 9 dollars, the payment will be 9 x the number of T-shirts.
If a customer orders 10 or more T-shirts, and less then 20, then the customer will get a discount of 9 dollars, thus the payment will be (9 x the number of T-shirts) - 9.
If a customer orders 20 or more T-shirts, then the customer will get a discount of 18 dollars, thus the payment will be (9 x the number of T-shirts) - 18.
In addition, if a customer has a coupon, then there will be an additional discount of 5 dollars.
After computing its payment including its discounts, it should print out the payment amount, along with the number of T-shirts.

Here is a sample output (user input is in bold):

Welcome to our T-shirt shop!
How many T-shirts would you like to purchase?
19
Do you have a coupon? Enter 1 for Yes, 0 for No:
1
Your total payment for this purchase: 157 dollar(s) for 19 T-shirt(s)

-----------------------------------------------

Here is another sample output (user input is in bold):

Welcome to our T-shirt shop!
How many T-shirts would you like to purchase?
8
Do you have a coupon? Enter 1 for Yes, 0 for No:
0
Your total payment for this purchase: 72 dollar(s) for 8 T-shirt(s)

-----------------------------------------------

Here is another sample output (user input is in bold):

Welcome to our T-shirt shop!
How many T-shirts would you like to purchase?
-1
Please enter a positive integer.

-----------------------------------------------

Explanation / Answer

SOLUTION :

$LC0:

.ascii "Enter number of T-shirts: "

$LC1:

.ascii "%d"

$LC2:

.ascii "Please enter a positive integer."

$LC3:

.ascii "Do you have a coupan(y/n):"

$LC4:

.ascii " %c"

$LC5:

.ascii "Amount to be paid for %d t-shirts: %d"

main:

addiu $sp,$sp,-48

sw $31,44($sp)

sw $fp,40($sp)

move $fp,$sp

lui $2,%hi($LC0)

addiu $4,$2,%lo($LC0)

jal printf

nop

addiu $2,$fp,28

move $5,$2

lui $2,%hi($LC1)

addiu $4,$2,%lo($LC1)

jal scanf

nop

lw $2,28($fp)

nop

beq $2,$0,$L2

nop

lw $2,28($fp)

nop

bgez $2,$L3

nop

$L2:

lui $2,%hi($LC2)

addiu $4,$2,%lo($LC2)

jal puts

nop

move $4,$0

jal exit

nop

$L3:

lw $2,28($fp)

nop

slt $2,$2,10

beq $2,$0,$L4

nop

lw $3,28($fp)

nop

move $2,$3

sll $2,$2,3

addu $2,$2,$3

sw $2,24($fp)

b $L5

nop

$L4:

lw $2,28($fp)

nop

slt $2,$2,20

beq $2,$0,$L6

nop

lw $2,28($fp)

nop

addiu $3,$2,-1

move $2,$3

sll $2,$2,3

addu $2,$2,$3

sw $2,24($fp)

b $L5

nop

$L6:

lw $3,28($fp)

nop

move $2,$3

sll $2,$2,3

addu $2,$2,$3

addiu $2,$2,-18

sw $2,24($fp)

$L5:

lui $2,%hi($LC3)

addiu $4,$2,%lo($LC3)

jal printf

nop

addiu $2,$fp,32

move $5,$2

lui $2,%hi($LC4)

addiu $4,$2,%lo($LC4)

jal scanf

nop

lb $3,32($fp)

li $2,121 # 0x79

bne $3,$2,$L7

nop

lw $2,24($fp)

nop

addiu $2,$2,-5

sw $2,24($fp)

$L7:

lw $2,28($fp)

lw $6,24($fp)

move $5,$2

lui $2,%hi($LC5)

addiu $4,$2,%lo($LC5)

jal printf

nop

move $2,$0

move $sp,$fp

lw $31,44($sp)

lw $fp,40($sp)

addiu $sp,$sp,48

j $31

nop

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