# 2d.s - Practice with a 2-D array
# In the data segment, we have a 6x8 array of integers.
# The user will specify which cell to view, by selecting
# the desired row and column numbers.

        .data
a:              .word  440 498 496 200 502  11 491 501
                .word  493 500 535 488 536 492 274 275
                .word  316 311 537 403 503 317 171 312
                .word  170 522  32 540 143 379 313 533
                .word  120 156 144 155 121 186 544 145
                .word   51  99 314 419 547  58 107 389
b:              .word   -5
prompt_row:     .asciiz "Enter desired row number (0-5):  "
prompt_col:     .asciiz "Enter desired column number (0-7):  "
intro_output:   .asciiz "Your cell's value is "
newline:        .asciiz "\n"

# Register use
# $s0 = base address of array a
# $s1 = desired row number (0-5)
# $s2 = desired col number (0-7)
# $s3 = address of desired cell
# $s4 = value in desired cell

        .text
main:
        la $s0, a               # Load the base address.
        
# -------------------------------------------------------------------
# Input
# -------------------------------------------------------------------
        li $v0, 4
        la $a0, prompt_row
        syscall
        
        li $v0, 5
        syscall
        move $s1, $v0
        
        li $v0, 4
        la $a0, prompt_col
        syscall
        
        li $v0, 5
        syscall
        move $s2, $v0

# -------------------------------------------------------------------
# Calculate the address of the desired cell, and load its value.
# -------------------------------------------------------------------





# -------------------------------------------------------------------
# Output
# -------------------------------------------------------------------
        li $v0, 4
        la $a0, intro_output
        syscall
        
        li $v0, 1
        move $a0, $s4
        syscall
        
        li $v0, 4
        la $a0, newline
        syscall

# -------------------------------------------------------------------
# The end
# -------------------------------------------------------------------
        li $v0, 10
        syscall