Question

All in MIPS assembly

1. Have the user input a 32 bit binary string

2. convert that into decimal

3. Print the decimal

Answer 1

.data

msg1: .asciiz

msg2: .asciiz

buffer: .space

.text

main:

li $v0, 4

la $a0 ,msg1

syscall

li $v0, 8

la $a0 ,buffer

li $a1, 33

move $t2 , $a0

syscall

li $s1, 32

li $s2, 30

biToDecLoop:

li $t0 , '0'

li $t1, '1'

lb $t3, ($t2)

beq $t3, $t0, binaryZero

beq $t3, $t1, binaryOne

binaryZero:

subi $s2. $s2, 1

j biToDecNext

binaryOne

add $t3,$t3,1

mul $t3,$t3,2

subi $s2,$s2,1

bne $s2, $zero, binaryOne

move $t4, $t3

add $t5, $t5,$t4

li $t0,32

li $t1,33

beq $s1, $t0, addTwo

beq $s1, $t1, addOne

j biToDecNext

addTwo:                                         # Check if there is a 1 in the second to last index of string
        add $t5, $t5, 2                         # Add 2 to total ($t5)
        j biToDecNext

addOne:                                         # Check if there is a 1 in the last index of string
        add $t5, $t5, 1                         # Add 1 to total ($t5)
        j biToDecNext   
        
biToDecNext:
        add $t2, $t2, 1                         
        subi $s1, $s1, 1                        # Decrement outer loop counter
        bne $s1, $zero, biToDecLoop             # Loop until outer counter reaches zero

end: 
        li      $v0, 4                                                                          
        la      $a0, newLine                                    
        syscall 

        li      $v0, 4                                                                  
        la      $a0, msg2                                       
        syscall 
        
        #move $a0, $t5                          
        li      $v0, 1                          
        la      $a0 ($t5)
        syscall

        li $v0, 10  
        syscall
        

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