Writing a program with assembler (MIPS)

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I need to write a program with MIPS for an evaluation of an exam. If someone gets ≥ 40 points, he succeeded and if he gets <40 points, he failed.

At the beginning the variable "Success" get's 99, which means that we do not know if someone succeeded or not.

The task is to complete the program so that we get 1 for successful and 0 for not successful.

.data
Points : .word 42 # Exampoints
Success : .word 99 # 0 No, 1 Yes, 99 We don't know
Minimum: .word 40 # MinimumToSucceed 40 Points

.text
.globl main
.
.
.

What I have tried:

.data
Points : .word 42 # Exampoints
Success : .word 99 # 0 No, 1 Yes, 99 We don't know
Minimum: .word 40 # MinimumToSucceed 40 Points

.text
.globl main

main:

lw $2,Points
lw $3,Minimum
lw $4,Success

loop:blt $2,$3,end
li $4,1

end:li $4,0

li $2,10 #these two last lines are just to complete
syscall #the program without errors (not task related)

Oh i just discovered a problem: If i use numbers lower than 0 or greater than 99 for "Points", it still gives me 1 for sucessful (e.g 105 > 40) and 0 for failed (e.g. -5 < 40).

How can i integrate this in my program?

Posted 9-Jan-20 3:33am

Member 14711617

Updated 9-Jan-20 4:32am

v2

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Comments

Kris Lantz 9-Jan-20 9:38am

This smells like homework. Have you attempted the problem, so that one might offer some guidance, over just the solution?

Kornfeld Eliyahu Peter 9-Jan-20 9:50am

Have you done ANYTHING on your own?
CP not much for a code-request site... It is more about help-yourself and CP will join in...

Patrice T 9-Jan-20 10:20am

Use Improve question to update your question.
So that everyone can pay attention to this information.

Kris Lantz 9-Jan-20 10:28am

You can check to make sure data is within the 0-99 bounds before checking the success/failed.

Member 14711617 9-Jan-20 10:43am

Is it possible to write a text with assembler? I do not know how to say "Number too big or too low".

Kris Lantz 9-Jan-20 10:48am

I personally am not familiar with MIPS syntax, but the first slide here might be useful. https://courses.cs.vt.edu/cs2506/Fall2014/Notes/L04.MIPSAssemblyOverview.pdf

Member 14711617 9-Jan-20 10:57am

Okay thanks tho. The only way to solve this problem i could think of is to add another line at .data, called "Lowest" for example. Since "Success" is already set to 99, a "Highest" won't be neccessary. At main it would look like this:

loop:blt $2,$5,fail # if lower than 0
loop:bgt $2,$4,fail # if greater than 99
loop:blt $2,$3,end
.
.
.
But we are not allowed to change the lines at .data afaik.

Tbh i think i will ignore this problem and just finish my task without considering points of lower than 0 or higher than 99. Since i solved the other tasks well, 1-2 points less won't matter. Thanks for your help :D

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Richard MacCutchan · Answer 1 · 2020-01-09T03:51:00

Solution 1

See mips assembler - Google Search[^]

Posted 9-Jan-20 3:51am

Richard MacCutchan