Category: Assembly Language

fix the code this code runs a maze game on mips assembly language and the code runs on MARS program. the problem in the game is when a player plays maze game * goes to the number and when it ask you for the sum of the number is going to and you enter the sum it tells you its invalid input. even though you put the right answer. SEE THE PICTURE AND FIX THE CODE DONT DO NEW CODE FIX THAT ONE. .data
maze: .asciiz “n##########n#*1342171#n#01#####1#n#84#19224#n####1#####n#11#12561#n#16#####1#n#64131281#n##1#######n#12647893E#n”
win_msg: .asciiz “You win!n”
prompt: .asciiz “Enter move (w/a/s/d): ”
invalid_move: .asciiz “Invalid move!n”
current_sum_msg: .asciiz “Current Sum: ”
correct_answers_msg: .asciiz “Correct Answers: ”
time_elapsed_msg: .asciiz “Time Elapsed: ”
seconds_msg: .asciiz ” secondsn”
final_sum_msg: .asciiz “Final Sum: ”
final_correct_answers_msg: .asciiz “Total Correct Answers: ”
final_time_msg: .asciiz “Total Time: ”
newline: .asciiz “n”
debug_msg: .asciiz “Debug: Reached En”
debug_position: .asciiz “Debug: Position: ”
debug_character: .asciiz ” Character: ”
debug_reached: .asciiz ” Debug: Reached ‘E’!n”
prompt_sum_part1: .asciiz “Enter the sum of the number ”
prompt_sum_part2: .asciiz ” in the maze: ”
invalid_input: .asciiz “Invalid input! Please enter an integer.n”
maze_width: .word 10
maze_height: .word 10
player_x: .word 1
player_y: .word 1
current_sum: .word 0
correct_answers: .word 0
start_time: .word 0
end_time: .word 0
input_buffer: .space 8 # Buffer for reading input as a string
.text
main:
# Initialize player position
la $t0, player_x
la $t1, player_y
li $t2, 1
sw $t2, 0($t0)
sw $t2, 0($t1)
# Initialize game stats
la $t3, current_sum
sw $zero, 0($t3)
la $t3, correct_answers
sw $zero, 0($t3)
# Initialize start time
li $v0, 30 # System call for time
syscall
la $t3, start_time
sw $v0, 0($t3)
# Print initial maze
la $a0, maze
li $v0, 4
syscall
# Display initial stats
jal display_stats
game_loop:
# Load player position
lw $t0, player_x
lw $t1, player_y
# Calculate player position in the maze string
la $t9, maze
li $t4, 11 # Each row is 11 characters including newline
mul $t5, $t0, $t4 # Row offset
add $t5, $t5, $t1 # Column offset
add $t5, $t5, $t9 # Final address in maze string
# Restore original maze character (if not starting position)
bne $t0, 1, not_starting_pos
bne $t1, 1, not_starting_pos
j skip_restore
not_starting_pos:
li $t6, ‘ ‘ # Assuming empty space
sb $t6, 0($t5)
skip_restore:
# Prompt for move
la $a0, prompt
li $v0, 4
syscall
# Read user input
li $v0, 12
syscall
move $t3, $v0
# Validate user input
li $t7, ‘w’
li $t8, ‘a’
li $t9, ‘s’
li $t0, ‘d’
beq $t3, $t7, process_input
beq $t3, $t8, process_input
beq $t3, $t9, process_input
beq $t3, $t0, process_input
j invalid
process_input:
# Calculate new position based on input
lw $t0, player_x
lw $t1, player_y
move $t4, $t0
move $t5, $t1
beq $t3, ‘w’, move_up
beq $t3, ‘a’, move_left
beq $t3, ‘s’, move_down
beq $t3, ‘d’, move_right
move_up:
sub $t4, $t0, 1
j validate_move
move_down:
add $t4, $t0, 1
j validate_move
move_left:
sub $t5, $t1, 1
j validate_move
move_right:
add $t5, $t1, 1
j validate_move
validate_move:
# Check boundaries
lw $t6, maze_width
lw $t7, maze_height
bltz $t4, invalid
bltz $t5, invalid
bge $t4, $t7, invalid
bge $t5, $t6, invalid
# Calculate maze index
li $t8, 11 # Each row is 11 characters including newline
mul $t8, $t8, $t4 # Row offset
add $t8, $t8, $t5 # Column offset
# Check maze value at new position
la $t9, maze
add $t9, $t9, $t8
lb $t9, 0($t9)
# Debug: Print position and character
la $a0, debug_position
li $v0, 4
syscall
move $a0, $t4
li $v0, 1
syscall
la $a0, debug_character
li $v0, 4
syscall
move $a0, $t9
li $v0, 11
syscall
la $a0, newline
li $v0, 4
syscall
# Check if move is valid
beq $t9, ‘#’, invalid
# Check if player reached the end ‘E’
li $t0, ‘E’
beq $t9, $t0, win
# Check if stepping on a number
sub $t6, $t9, ‘0’ # Convert character to number
bltz $t6, skip_update
bgt $t6, 9, skip_update
# Prompt for sum
move $t2, $t6 # Save the number to $t2 for sum check
jal prompt_for_sum
# Update current sum
lw $t7, current_sum
add $t7, $t7, $t6
sw $t7, current_sum
# Increment correct answers count
lw $t7, correct_answers
addi $t7, $t7, 1
sw $t7, correct_answers
skip_update:
# Update player position
sw $t4, player_x
sw $t5, player_y
# Calculate the new position in the maze string
la $t9, maze
lw $t0, player_x
lw $t1, player_y
li $t4, 11 # Each row is 11 characters including newline
mul $t5, $t0, $t4 # Row offset
add $t5, $t5, $t1 # Column offset
add $t5, $t5, $t9 # Final address in maze string
# Update the player’s position in the maze
li $t6, ‘*’
sb $t6, 0($t5)
# Print maze
la $a0, maze
li $v0, 4
syscall
# Display current sum and correct answers
jal display_stats
j game_loop
invalid:
la $a0, invalid_move
li $v0, 4
syscall
j game_loop
win:
# Record end time
li $v0, 30 # System call for time
syscall
la $t3, end_time
sw $v0, 0($t3)
# Debug message to indicate we have reached the win condition
la $a0, debug_reached
li $v0, 4
syscall
# Display win message
la $a0, win_msg
li $v0, 4
syscall
# Display final stats
jal display_final_stats
# End the game by exiting the program
li $v0, 10
syscall
display_stats:
# Display current sum
la $a0, current_sum_msg
li $v0, 4
syscall
lw $a0, current_sum
li $v0, 1
syscall
# Display correct answers count
la $a0, correct_answers_msg
li $v0, 4
syscall
lw $a0, correct_answers
li $v0, 1
syscall
# Display time elapsed
li $v0, 30 # System call for time
syscall
la $t4, start_time
lw $t4, 0($t4)
sub $t6, $v0, $t4
la $a0, time_elapsed_msg
li $v0, 4
syscall
move $a0, $t6
li $v0, 1
syscall
la $a0, seconds_msg
li $v0, 4
syscall
# Print newline
la $a0, newline
li $v0, 4
syscall
jr $ra
display_final_stats:
# Display final sum
la $a0, final_sum_msg
li $v0, 4
syscall
lw $a0, current_sum
li $v0, 1
syscall
# Display final correct answers count
la $a0, final_correct_answers_msg
li $v0, 4
syscall
lw $a0, correct_answers
li $v0, 1
syscall
# Calculate and display total time
la $t4, end_time
lw $t4, 0($t4)
la $t5, start_time
lw $t5, 0($t5)
sub $t6, $t4, $t5
la $a0, final_time_msg
li $v0, 4
syscall
move $a0, $t6
li $v0, 1
syscall
la $a0, seconds_msg
li $v0, 4
syscall
# Print newline
la $a0, newline
li $v0, 4
syscall
jr $ra
prompt_for_sum:
# Display the current number
la $a0, prompt_sum_part1
li $v0, 4
syscall
# Display the number to sum
move $a1, $t2 # Move the number to $a1 for display
addi $a0, $a1, ‘0’ # Convert number to ASCII
li $v0, 11 # Print character
syscall
# Display the rest of the prompt
la $a0, prompt_sum_part2
li $v0, 4
syscall
# Read user input as a string
li $v0, 8 # Read string
la $a0, input_buffer
li $a1, 8 # Buffer size
syscall
# Ensure input is null-terminated
la $t0, input_buffer
li $t1, 0
sb $t1, 7($t0) # Null-terminate the input
# Print the input string for debugging
la $a0, input_buffer
li $v0, 4
syscall
# Convert string to integer
la $a0, input_buffer
jal str_to_int
# Check if the conversion was successful
bltz $v0, invalid # If conversion failed, go to invalid
# Calculate expected sum
lw $t1, current_sum
add $t1, $t1, $t2 # $t2 contains the number from the maze
# Check if the sum is correct
beq $v0, $t1, correct_sum
j invalid
correct_sum:
# If the sum is correct, return
jr $ra
str_to_int:
# Convert a string in $a0 to an integer in $v0
li $v0, 0
li $t0, 0
str_to_int_loop:
lb $t1, 0($a0) # Load byte from string
beqz $t1, str_to_int_end # If null terminator, end
sub $t1, $t1, ‘0’ # Convert char to integer
blt $t1, 0, str_to_int_skip # If char < '0', skip bgt $t1, 9, str_to_int_skip # If char > ‘9’, skip
mul $v0, $v0, 10 # Multiply current result by 10
add $v0, $v0, $t1 # Add the digit
str_to_int_skip:
addi $a0, $a0, 1 # Move to the next char
j str_to_int_loop
str_to_int_end:
jr $ra
str_to_int_error:
la $a0, invalid_input
li $v0, 4
syscall
li $v0, -1
jr $ra