Answered: la $t8, array #loads array pointer 58…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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This is my code for an MIPS assignment where im taking numbers into an array and reversing within the array (I.E not creating another array)

.data

str1: .asciiz "Enter size of the array: "

str2: .asciiz "Error! The array element must be divisble by 3. "

str3: .asciiz "Error! The size of the array must be postive. "

str4: .asciiz "Error! the elements of array must be postive. "

str5: .asciiz "Error! The size of the array must be less than 20. "

str6: .asciiz "Error! The size of the array must be greater than 0. "

str7: .asciiz "The elements in array in reversed order is as follows:\n "

str8: .asciiz " "

str9: .asciiz "Enter a element for the array: "

array: .word 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0

.text

main:

arraysize:

li $v0, 4

la $a0, str1#prompts user for size of array

syscall

li $v0, 5#takes user input for size of array

syscall

add $t0, $v0, $0#moves the user's value from $v0 to $t0

li $t9, 20#loads 20 into $t9

bgt $t0, $t9, err1#if greater than 20, goes to err1

ble $t0, $0, err2#if less than 0, goes to err2

add $t3, $t0, $0#move values into $t1

la $t2, array#Loads array pointer

j creatArray

creatArray:

li $v0, 4

la $a0, str9

syscall

li $v0, 5#takes user's element to fill array

syscall

add $t1, $v0, 0 #moves $v0 into $t1

blt $t1, 0, negative #checks if element is negative, goes to negative

li $t8, 3#loads 3 into $t5, will be used to check divibility

div $t1, $t8#divides $t1 by $t8

mfhi $t8#stores remainder if there is

bne $t8, 0, notdiv#if there is remainder greater than 0, its not divible by 3

addi $t0, $t0, -1

sw $t1, 0($t2)#stores $t1 into the array

add $t2, $t2, 4#increments the array by 4 bytes

bgt $t0, 0, creatArray

la $t8, array#loads array pointer

addi $t2, $t2, -4

add $t1, $t3, 0#moves values from $t3 into $t1

j reverse

reverse:

lw $t7,($t2)#loading the array($t2 into $t7)

lw $t9,($t8)#loadibg the array($t8 into $t9)

sw $t7,($t8)#stores into array

sw $t9,($t2)#stores into array

add $t2, $t2, -4#decrements the array, taking number from tail

add $t8, $t8, 4#incremens the array, putting into the head

bge $t8,$t2, print

j reverse

print:

la $t2, array#loads array

li $v0, 4

la $a0, str7#prompts string

syscall

printArray:

lw $t5, ($t2)#loads #$t2 into $t5

li $v0, 1

add $a0, $t5, $0#moves $t5 into $a0 and prints

syscall

li $v0, 4

la $a0, str8#prompts a space

syscall

add $t1, $t1, -1#increment

add $t2, $t2, 4#incement

bgt $t1, 0, printArray#prints array until empty

exit:

li $v0, 10#terminates program

syscall

err1:

li $v0, 4

la $a0, str5#prompts error

syscall

j arraysize#loops back to arraysize

err2:

li $v0, 4

la $a0, str6#prompts error

syscall

j arraysize#loops back to arraysize

negative:

li $v0, 4

la $a0, str4

syscall

j creatArray

notdiv:

li $v0, 4

la $a0, str2

syscall

j creatArray

-----------------------------

in the attached image is the reversing part... can someone explain in detail what exactly or how it is exactly reversing

la $t8, array
#loads array pointer
58
59
addi $t2, $t2, -4
add $t1, $t3, 0
60
#moves values from $t3 into $t1
61
62
j reverse
63
64
reverse:
65
lw $t7, ($t2)
lw $t9, $t8)
Sw $t7, ($t8)
sw $t9, ($t2)
#loading the array($t2 into $t7)
#loadibg the array($t8 into $t9)
#stores into array
#stores into array
66
67
69
70
add $t2, $t2, -4
add $t8, $t8, 4
bge $t8, $t2, print
#decrements the array, taking number from tail
#incremens the array, putting into the head
71
72
74
j reverse
75
76
77 print
883RRSRSRSE.

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