Question

Lab-3A One-way Conditional Branching

Write MIPS assembly code to prompt and read an integer value X, and to calculate and display |X|.

Example Input/Output

Enter an integer X : 14

The absolute value is 14

Enter an integer X: -14

The absolute value is 14

Submit a single word document with the:

~MIPS code and screenshots showing:
~ ML code & Registers before execution
~ Input/Output console with at least three test data

(should cover all partitions – one positive number, one negative number, and zero)

Answer 1

Screenshot(Program)

Program

###########################################################
#Create a program to find absolute value
#Of user entered value
###########################################################
.data
   input: .asciiz "Enter an integer X : "
   output: .asciiz "The absolute value is "
#Program starts here
.globl main
.text  
main:
   #Prompt for input
   addi $v0,$0,4
   la $a0,input
   syscall
   #Read input
   addi $v0,$0,5
   syscall
   #Store into a0
   add $a0,$0,$v0
   #Call function to get absolute value
   jal absolute
   #Result in a0
   add $t0,$0,$v0
   #Display output message
   addi $v0,$0,4
   la $a0,output
   syscall
   #Display result
   add $a0,$0,$t0
   addi $v0,$0,1
   syscall
   #Display next line
   addi $a0,$0,10
   addi $v0,$0,11
   syscall

   #Prompt for input
   addi $v0,$0,4
   la $a0,input
   syscall
   #Read input
   addi $v0,$0,5
   syscall
   #Store into a0
   add $a0,$0,$v0
   #Call function to get absolute value
   jal absolute
   #Result in a0
   add $t0,$0,$v0
   #Display output message
   addi $v0,$0,4
   la $a0,output
   syscall
   #Display result
   add $a0,$0,$t0
   addi $v0,$0,1
   syscall

   #End of the program
   addi $v0,$0,10
   syscall

#Implementation of absolute value
absolute:
   #number in v0
   add $v0,$0,$a0
   slt $t0,$0,$v0
   beq $t0,0,negation
   jr $ra
#Convert to positive
negation:
    sub $v0,$0,$v0
    jr $ra

Output