1. Write a MIPS assembly language program that reads a customer\'s current and p

Question

1.                  Write a MIPS assembly language program that reads a customer's current and previous meter readings of electricity and a month to compute its electricity bill.
If a customer spent 0 or less (technically this should not happen, though) KWH (kilowatt-hours) that is computed by current meter reading - previous meter reading,
then the program should print out "There is no bill to pay. ".
If a customer spent less than or equals to 200 KWH in a month, then the payment should be 10 dollars.
If a customer spent more than 200 KWH in a month of May, June, July, August, or September, then the payment is computed by:
payment = 10 + (used KWH - 200) / 15;
If a customer spent more than 300 KWH in any other month, then the payment is compute by:
payment = 10 + (used KWH - 200) /20;

Then if the payment is greater than 0, it should print out the payment amount, along with its used KWH.

Explanation / Answer

CODE (Explanation in comments):

# NOTE: There is no error handling for months in this code and bill will be printed in integer only

# initialising variales

.data:

curr_reading: .space 4

prev_reading: .space 4

month: .space 4

payment: .space 4

usage: .space 4

prompt1: .asciiz "Enter Current month reading: "

prompt2: .asciiz "Enter Previous month reading: "

prompt3: .asciiz "Enter Current month(1-12): "

prompt4: .asciiz "There is no Bill to Pay "

prompt5: .asciiz "Amount to pay: "

prompt6: .asciiz "Month: "

newline: .asciiz " "

# code

.globl main

.text

main:

#prompt for current month reading

li $v0, 4

la $a0, prompt1

syscall

#read value and store

li $v0, 5

syscall

sw $v0, curr_reading

#prompt for previous month reading

li $v0, 4

la $a0, prompt2

syscall

#read value and store

li $v0, 5

syscall

sw $v0, prev_reading

#prompt for month

li $v0, 4

la $a0, prompt3

syscall

#read value and store

li $v0, 5

syscall

sw $v0, month

#calculate usage

lw $t1, curr_reading

lw $t2, prev_reading

sub $t3, $t1, $t2

sw $t3, usage

#check for no usage and jump to loop

ble $t3, 0, no_usage

#initialize payment to 10 if there is usage

li $t4, 10

sw $t4, payment

#calculate total payment if more than 200kWH is used

bgt $t3, 200, calculate_total

#else print payment

b print_payment

#print no bill message and exit

no_usage:

li $v0, 4

la $a0, prompt4

syscall

b exit

#calculat total based on month

calculate_total:

lw $t2, usage

lw $t3, month

sub $t2, $t2, 200

#divide by 15 if between may and september

blt $t3, 5, div_15

bgt $t3, 9, div_15

#else divide by 20

div $t2, $t2, 20

b final_payment

div_15:

div $t2,$t2,15

#calculate final payment

final_payment:

lw $t1, payment

add $t1, $t1, $t2

sw $t1, payment

#print messages and exit

print_payment:

li $v0, 4

la $a0, prompt5

syscall

li $v0, 1

lw $a0, payment

syscall

li $v0, 4

la $a0, newline

syscall

li $v0, 4

la $a0, prompt6

syscall

li $v0, 1

lw $a0, month

syscall

li $v0, 4

la $a0, newline

syscall

exit:

li $v0, 10

syscall

OUTPUT:

Enter Current month reading: 10
Enter Previous month reading: 10
Enter Current month(1-12): 3
There is no Bill to Pay

-- program is finished running --

Reset: reset completed.

Enter Current month reading: 600
Enter Previous month reading: 200
Enter Current month(1-12): 11
Amount to pay: 23
Month: 11

-- program is finished running --

Reset: reset completed.

Enter Current month reading: 900
Enter Previous month reading: 150
Enter Current month(1-12): 6
Amount to pay: 37
Month: 6

-- program is finished running --

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