Question

Write a MIPS program that negates a positive number using 2s complement. E.g.: 0x00000003 is converted into 0xFFFFFFFD.

Answer 1

.data
   string:    .asciiz "Enter a number: "
   result: .asciiz "2's complement is "

.text

   la $a0, string
   li $v0, 4
   syscall

   li $v0, 5
   syscall

   sub $t0, $zero, $v0

   la $a0, result
   li $v0, 4
   syscall

   move $a0, $t0
   li $v0, 1
   syscall

   li $v0, 10
   syscall