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POIf statements, logical AND, comparisons
 

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    <p>I'm new to MIPS assembly language. Just started to learn. I've got this problem where I have to display a letter grade for the test score that the user inputs. I've done this so far, but I cannot get it to work. I always keep getting invalid or sometimes the program ends or gives a D.</p> <p>It is assumed:</p> <pre><code>Score Range Letter Grade 90 to 100 A 80 to 89 B 70 to 79 C 60 to 69 D 0 to 59 F </code></pre> <p>Please help me figure out what I'm doing wrong and correct my code!</p> <pre><code>.data prompt: .asciiz "Enter a test score [0 to 100] or -1 to stop: " invalidPrompt: .asciiz "Invalid \n" A: .asciiz "A \n" B: .asciiz "B \n" C: .asciiz "C \n" D: .asciiz "D \n" F: .asciiz "F \n" .globl main .text main: li $v0, 4 la $a0, prompt syscall li $v0, 5 syscall #move $a1, $v0 beq $v0, -1, end # -1 to stop checkA: bge $v0, 90, checkB ble $v0, 100, checkB li $v0, 4 la $a0, A syscall # j main checkB: bge $v0, 80, checkC ble $v0, 89, checkC li $v0, 4 la $a0, B syscall # j main checkC: bge $v0, 70, checkD ble $v0, 79, checkD li $v0, 4 la $a0, C syscall # j main checkD: bge $v0, 60, checkF ble $v0, 69, checkF li $v0, 4 la $a0, D syscall # j main checkF: #bge $v0, 0, invalid ble $v0, 59, end li $v0, 4 la $a0, D syscall # j main invalid: blt $v0, 0, end bge $v0, 100, end li $v0, 4 la $a0, invalidPrompt syscall # j main j main end: #--- TERMINATE --- li $v0, 10 # terminate program run and syscall # return control to the OS. </code></pre> <p>The second part of the problem is I have to display the number of A's, B's and so on after user enters -1. How can I go about this? I know I have to store the count of each grade when true in a separate register and keep incrementing but not sure how this is done.</p> <p>Edit: I am using MARS 4.1 tool on Windows 7.</p>
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