Islamic University-Gaza
Faculty of Engineering
Computer Department
Project
For Computer Architecture
Names:Suhair Dawoud
ID :22008 1464
Nedaa Jaber
ID:2008 0716
To:Eng.Doaa Abu Jabal
Objectives:
The basic objective of this Project is to calculate the difference between two strings
and comparing each character in the first string with the character at the same index
in the second string then display the result.
Brief Details:
This code contains one loops and jumps as described below:
Loop in the procedure “comp” to take the elements from the specific index that we
are interested in from the first array to compare it with element from the second array
at the same index, if its not equal the ith will be increment each time also the count
will increments with one .
Then, the count is now having the number of different chars by move it to $v0 and
then use the integer print instruction to print the difference .
procedure to compare and count the different between the two arrays then return the
result in $v0 .
Java code :
The output:
The Code:
.data
Array1: .word 's',u','h','a','i','r'
Array2: .word 's','a','h','a','r'
msg0: .asciiz "The difference between two strings =" # asciiz is terminated string
msg1: .asciiz "The difference between the two strings in length "=
msg2: .asciiz "The number of different characters in the two strings "=
msg3: .asciiz "The First name:suhair\n "
msg4: .asciiz "The second name:sahar\n"
newline: .asciiz "\n"
.text
main:
## print the first name
la $a0,msg3
li $v0,4
#
syscall
# syscall prints whatever found in $a0
is code for print string
#
execute system call
## print the second name
la $a0,msg4
li $v0,4
4#
syscall
# syscall prints whatever found in $a0
is code for print string
#
execute system call
$ # s1 -lenght of array1
$ # s2 -lenght of array2
addi $s1,$zero,6
addi $s2,$zero,5
la $s6,Array1
la $s7,Array2
# load adress of the array into s6
#load adress of the array into s7
# comparing the length of two array
bne $s1,$s2,l1
add $a0,$zero,$s2
jal comp
move $t5,$v0
# s1!=s2 go to L1,else go to next step
# s2 :lenght of array
# v0:the no.of diffrenent chars from the proc
## print msg2 and the answer
la $a0,msg2
# syscall prints whatever found in $a0
li $v0,4 4 #
is code for print string
syscall
move $a0,$t5
li $v0,1
syscall
la $a0,newline
li $v0,4
syscall
# a0= v0 bcz syscall prints whatever found in $a0
# 1 is code for print int
# print new line
# print the msg1 and the answer
la $a0,msg1
li $v0,4
syscall
addi $t7,$zero,0
# a0=0 bcz there are no different between lenght we
print 0
move $a0,$t7
li $v0,1
syscall
la $a0,newline
li $v0,4
syscall
# print new line
# print msg0 and the answer
la $a0,msg0
li $v0,4
syscall
move $a0,$t5
li $v0,1
syscall
la $a0,newline
li $v0,4
syscall
j exit
# exit the programe
l1:
bgt $s1,$s2,big
blt $s1,$s2,small
# if s1> s2 go to big
# if s2<s1 go to small
big :
add $a0,$zero,$s2
jal comp
# s2 "the lenght of small array"
move $t0,$v0
sub $t3,$s1,$s2
add $t4,$t3,$t0
# v0 "The number of different characters"
# sub the small lenght from big lenght "t3=s1-s2"
# add the diff lenght and diff characher
# print msg2 and the answer
la $a0,msg2
li $v0,4
syscall
move $a0,$t0
li $v0,1
syscall
la $a0,newline
li $v0,4
syscall
#print msg1 and the answer
la $a0,msg1
li $v0,4
syscall
move $a0,$t3
li $v0,1
syscall
la $a0,newline
li $v0,4
syscall
# print msg0 and the answer
la $a0,msg0
li $v0,4
syscall
move $a0,$t4
li $v0,1
syscall
la $a0,newline
li $v0,4
syscall
j exit
small :
add $a0,$zero,$s1
jal comp
move $t0,$v0
# t0= v0 "The number of different characters "
sub $t3,$s2,$s1
# code to sub the small lenght from big lenght "t3=s2-s1"
add $t4,$t3,$t0 # code to add the diff lenght and diff characher "t4=t3+t0"
## print msg2 and the answer
la $a0,msg2
li $v0,4
syscall
move $a0,$t0
li $v0,1
syscall
la $a0,newline
li $v0,4
syscall
# print msg1 and the answer
la $a0,msg1
li $v0,4
syscall
move $a0,$t3
li $v0,1
syscall
la $a0,newline
li $v0,4
syscall
# print msg0 and the answer
la $a0,msg0
li $v0,4
syscall
move $a0,$t4
li $v0,1
syscall
la $a0,newline
li $v0,4
syscall
j exit
comp:
#s5 for i
#s0 for counter
add $s0,$zero,$zero
add $s5,$zero,$zero
loop:
#
slt $t2,$s5,$a0
beq $t2,$zero,final
# counter=0
# i=0
a0= lenght of small array , s5=i
sll $t4,$s5,2
add $s3,$t4,$s6
lw $t2,0($s3 )
add $s4,$t4,$s7
lw $t3,0($s4)
addi $s5,$s5,1
beq $t2,$t3,returncount
addi $s0,$s0,1
#counter++
j loop
returncount
j loop
:
final:
move $v0,$s0
jr $ra
exit:
li $v0,10
syscall
Screen shot of the output:
Conclusion:
I found some problem but I can overcome it by hard work
and have some experience .