Question

how do i take input from user that gives first and last name and flip it to display last, first in mips assembly language? please need help. looking through this mips book to get anything.

Answer 1

Screenshot

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Program

#Data declaration part
.data
input: .asciiz "Enter your name:"
nameInput: .asciiz
#Program starts here
.text
#Prompt for name
li $v0,4
la $a0,input
syscall
#Read name and store in nameInput
li $v0,8
la $a0,nameInput
li $a1,1024
syscall
#Get address of name storage space
la $t0,nameInput
#Loop to find space
loop:
lb $a0,($t0)
beq $a0,32,next
addi $t0,$t0,1
j loop
#If space encounter then came here then next letter is the
#starting character of last name
next:
    addi $t0,$t0,1
    #Loop to read until \n and print character by character
printLastName:
   lb $a0,($t0)
   beq $a0,10,printFirstName
   li $v0,11
   syscall
addi $t0,$t0,1
j printLastName
#For first name print
printFirstName:
   #Get starting address of the name storage
   la $t0,nameInput
   #Display comma
   li $v0,11
   li $a0,44
   syscall
   #Display space
   li $v0,11
   li $a0,32
   syscall
   #Loop to print first name,means until space
loop2:
    lb $a0,($t0)
    beq $a0,32,exit
    li $v0,11
   syscall
addi $t0,$t0,1
j loop2
#End of the program
exit:
li $v0,10
syscall

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Output

Enter your name:Charlie Gomaz
Gomaz, Charlie
-- program is finished running --