Question

4-Translate the following C program to MIPS assembly program (Please explain each instruction in your code by a comment and submit a .asm file) int main() { char Str1[6]= {'h','e','l','l','o','\0'}; char Str2[5]= {'m','a','r','s','\0'}; int i, j; i = 0; while( Str1[i]!='\0') { i++; } j = 0; while( Str2[j]!='\0') { Str1[i] = Str2[j]; i++; j++; } Str1[i] = '\0'; printf("\n String after the Concatenate = %s", Str1); return 0; }

Answer 1

Answer:

.data

str1: .asciiz "Hello"

str2: .asciiz "mars"

msg: .asciiz "String after the concatenate: "

.text

main:

#load the address str1 to $a0

la $a0,str1

#initialize $t0 with 0

li $t0,0

#loop to find the length of str1

#$t0 stores the length of str1

loop1:

#load byte of $a0 to $t1

lb $t1,0($a0)

#branch for equal.If $t1 equal to 0,jump to label stop1

beq $t1,0,stop1

addi $t0,$t0,1 #increase the count

addi $a0,$a0,1 #increase the address

#jump to label loop1

j loop1

stop1:

#load the address of str2 to $a1

la $a1,str2

#loop2 concatenate the each element in str2 to str1

loop2:

lb $t2,0($a1) #load character in str2 to $t2

sb $t2,0($a0) #store value in $t2 to str1

beq $t2,0,stop2

addi $a1,$a1,1 #increase the address of str2

addi $a0,$a0,1 #increase the address of str1

j loop2

stop2:

#syscall for print string is $v0 = 4

#syscall to termiante the program is $v0 = 10

#print the message

li $v0, 4

la $a0, msg

syscall

#print the concatenated string

li $v0,4

la $a0,str1

syscall

#termiante the program

li $v0, 10

syscall

Explanation: