#write a program that is going to take user input of two numbers (test it only with the 1st # > 2nd #) and then
#and then output: the sum/difference/quotient/product is and then actually do it, using the functions from the appendix
#furthermore when I am done, make it do an error message if 1st # < 2nd #
.globl main
.text
main:
#copied from the first program
li $v0, 4 #we're telling the program that we are going to be outputting a string and loading it immediately
la $a0, prompt_first_number #we're telling the program where to look for our message that we defined at the bottom of the program
syscall #go do it
#now, we should read in an integer as done by the user, with syscall 5
li $v0, 5 #syscall for code 5 (reading in an integer)
syscall #go do it
move $t0, $v0 #moving the stored integer from $v0 to $t0 so that we can free up the space for the termination code 10
#we now stored the value that the user input in $t0
#now for the second number, code is going to be pretty identical
#we can just copypaste this block because the new value in #v0/#a0 is going to bverwrite the old stuff
li $v0, 4 #we're telling the program that we are going to be outputting a string and loading it immediately
la $a0, prompt_second_number #we're telling the program where to look for our message that we defined at the bottom of the program
syscall #go do it
#now, we should read in an integer as done by the user, with syscall 5
li $v0, 5 #syscall for code 5 (reading in an integer)
syscall #go do it
move $t1, $v0 #moving the stored integer from $v0 to $t1 so that we can free up the space for the termination code 10
##at this point we have prompted the user for 2 numbers and have stored them in $t0 and $t1
##at this point, we want to test the two numbers and give the user an error message if the input is wrong
##not at this point, because we need to determine the difference of the two values, so it will need to happen after the arithmetic block
#probably with blez (see pg 17 and 79 in Britton)
#start at line 49 with ##error test here
##We will be storing the sum in t3, the difference in t4, the quotient in t5, and the product in t6
#arithmetic block
add $t3, $t0, $t1 #this should do: $t0+$t1 = something, which we put into $t3
sub $t4, $t0, $t1 #this should do: $t0-$t1 = something, which we put into $t4
div $t5, $t0, $t1 #this should do: $t0/$t1 = something, which we put into $t5
mul $t6, $t0, $t1 #this should do: $t0*$t1 = something, which we put into $t6
##error test here
#whoops forgot to tell it we're gonna load a string
#li $v0, 4
#nope wasn't it
#try evaluating it at #v0?
#move $v0, $t4
#nope
#stuff like replacing sub with subu and blez with bltzal doesn't either
blez $t4, brexit
#output block
#adzal dition
li $v0, 4 #tell the system we are going to load a string
la $a0, sum #tell it that the address of the string is in $a0
syscall #go do it
move $a0, $t3 #move the value stored $t0 to $a0
li $v0, 1 #tell it we're about to print an integer
syscall #go do it
#subtraction
li $v0, 4 #tell the system we are going to load a string
la $a0, diff #tell it that the address of the string is in $a0
syscall #go do it
move $a0, $t4 #move the value stored $t0 to $a0
li $v0, 1 #tell it we're about to print an integer
syscall #go do it
#division
li $v0, 4 #tell the system we are going to load a string
la $a0, quot #tell it that the address of the string is in $a0
syscall #go do it
move $a0, $t5 #move the value stored $t0 to $a0
li $v0, 1 #tell it we're about to print an integer
syscall #go do it
#multiplication
li $v0, 4 #tell the system we are going to load a string
la $a0, prod #tell it that the address of the string is in $a0
syscall #go do it
move $a0, $t6 #move the value stored $t0 to $a0
li $v0, 1 #tell it we're about to print an integer
syscall #go do it
#and now we're done
li $v0, 10
syscall
brexit: #we put it here because any actual code needs to be in .text, but I am putting it after the "program exit" command
#so that we don't accidentally run it during our program phase
li $v0, 4 #ready to output a string
la $a0, error_msg #give it the address of my string
syscall # go do it
li $v0, 10 #get ready to leave
syscall #leave
.data #gonna be storing our text and prompts here
prompt_first_number:
.asciiz "Enter your first number: \n"
prompt_second_number:
.asciiz "Enter your second number: \n"
sum:
.asciiz "\nThe sum is: "
diff:
.asciiz "\nThe difference is: "
quot:
.asciiz "\nThe quotient is: "
prod:
.asciiz "\nThe product is: "
error_msg:
.asciiz "Please terminate the program and input the numbers in the proper sequence - the first number must be greater than the second number."
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