.data   
file_buff:          .space  8           # A space of 2 bytes
                    .align  3
input_file_name:    .asciiz "a.in"
                    .align  3
output_file_name:   .asciiz "a.out"
                    .align  3
.text   

la      $a0,    input_file_name
li      $a1,    0                       # set mode as read
li      $a2,    0                       # meaning nothing, really
li      $v0,    13                      # open file
syscall                                 #now $v0 is the file handler

move    $a0,    $v0                     #move file handler to a0 as first syscall arg
la      $a1,    file_buff
li      $a2,    8                       # read in 8 bytes
li      $v0,    14
syscall 
li      $v0,    16
syscall                                 # close file

la      $a0,    output_file_name
li      $a1,    1                       # set mode as write
li      $a2,    0                       # meaning nothing, really
li      $v0,    13                      # open file
syscall 

move    $a0,    $v0
la      $a1,    file_buff
li      $a2,    8                       # write 8 bytes
li      $v0,    15                      # write file
syscall 
li      $v0,    16
syscall 

li      $v0,    5                       # read integer
syscall 
addi    $a0,    $v0,                10  # a0 = v0 + 10
li      $v0,    1                       # print integer
syscall