Question

IN MIPS!!! Question: Change this program to use XOR and ADD and take out XORI and ADDI.

data
   str1:   .asciiz "Enter a number you want to negate: "
   str2:   .asciiz "Your answer in Decimal is :"
   str3:   .asciiz "\nAnswer in Hex format: "
  
.text

   la $a0, str1
   li $v0, 4
   syscall
  
   li $v0, 5
   syscall
   move $t0, $v0
  
   xori $t0, 0xffffffff
   addi $t0, $t0, 1
  
   la $a0, str2
   li $v0, 4
   syscall
  
   move $a0, $t0
   li $v0, 1
   syscall
  
   la $a0, str3
   li $v0, 4
   syscall
  
   move $a0, $t0
   li $v0, 34
   syscall
  
   # exit program
   li $v0, 10
   syscall

Answer 1

Please up vote ,comment if any query . Thanks for Question .Be safe .

Note : check attached image for output ,code compiled and tested in MARS MIPS simulator .

Program Plan :

1. to replace xori with xor first load immediate value 0xfffffff into $t1
2. than use xor instruction
3. same for addi store immediate 1 into $t1 and use
4. add instruction .

Program :

.data
   #this program takes a decimal number and convert it into negative
   #and print hex representation of negative number
   #string declaration

   str1:   .asciiz "Enter a number you want to negate: "
   str2:   .asciiz "Your answer in Decimal is :"
   str3:   .asciiz "\nAnswer in Hex format: "

#code section
.text

   #print str1 string to prompt user to enter number
   la $a0, str1
   li $v0, 4 #syscall 4 to print integer
   syscall

   li $v0, 5 #read input from user
   syscall   #syscall 5 to read input
   move $t0, $v0 #store user input in $t0 from $v0
  
   #xori $t0, 0xffffffff
   li $t1,0xffffffff #first load 0xffffffff into $t0 $t1=0xffffffff
   xor $t0,$t0,$t1    #xor $t0 with $t1 and store in $t0 $t0=$t0^$t1

   li $t1,1 #load 1 in $t1 =1

    #t0=$t0+$t1
   add $t0, $t0, $t1 #add t1 into $t0= $t0+$t1

   #print str2 on console
   la $a0, str2
   li $v0, 4 #syscall 4 to print string
   syscall

   #move value of $t0 into $a0 to print it
   move $a0, $t0
   li $v0, 1 #syscall 1 to print integer
   syscall

   #print str3 on console
   la $a0, str3
   li $v0, 4 #syscall 4 to print string
   syscall

   #move integer value(negative) into $a0
   move $a0, $t0
   li $v0, 34 #syscall 34 to print hex repesentation
   syscall

   # exit program
   li $v0, 10 #syscall 10 to terminate program
   syscall

Output :

Please up vote ,comment if any query . i will reply and will make change.