Calculation Section

After reading the food cost, the program can do the calculations. It is convenient to do them all at once and then to print out the results.

## rest.asm
##
## Total restaurant bill calculator
##
## Register Use:
##
## $s0 tip+tax 
## $s1 tip rate
## $s2 tax rate
## $s3 meal cost
## $a0 tax+tip dollars

        .globl  main

        # Get meal cost
main:       $v0,4       # print a prompt (code 4 put in $v0)
            $a0,prompt  # address of prompt put in $a0
        syscall

            $v0,5       # input an integer  (code 5 put in $v0)
        syscall             # 32-bit result returned in $v0
          $s3,$v0     # save it in $s3

        # Calculations
        lw      $s1,_____        # get tip rate

        lw      $s2,_____        # get tax rate

        addu    $s3,$s1,$s2      # total rate

        _____   $s4,$s0,$s3      # 100*(tax + tip)

        _____    $s4,$s4,100     # tax + tip  

        _____  $s5,$s0,$s4       # total bill

       . . . . .

        .data
tip:    .word   15          # tip rate in percent
tax:    .word    8          # tax rate in percent

prompt: .asciiz "Enter food cost: "
head1 : .asciiz "   Tax plus tip: "
head2 : .asciiz "     Total cost: "
# end of file