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# RISC - V Assembly Code for Diamond Pattern . data prompt: . asciiz Enter a positive odd integer ( N ) : newline:

# RISC-V Assembly Code for Diamond Pattern
.data
prompt: .asciiz "Enter a positive odd integer (N): "
newline: .asciiz "
"
.text
main:
# Prompt user for input
li a1,1 # file descriptor (stdout)
li a2, prompt # pointer to the string
li a3,39 # string length
li a7,64 # system call code for write
ecall
# Read user input
li a0,0 # file descriptor (stdin)
li a2,10 # buffer size
li a7,8 # system call code for read
ecall
# Convert string to integer (you'll need a conversion subroutine)
# (This part is missing and requires a separate subroutine)
# Check if N is odd, adjust if necessary
# (You need to check the least significant bit to ensure it's odd)
# Initialize loop counters
li t0,1 # Loop counter for rows
draw_diamond:
# Draw the upper part of the diamond
beqz t0, draw_lower_diamond # Exit loop if upper part is done
# Calculate number of asterisks for the current row
li t1,2 # Number of asterisks for the first row
mul t1, t1, t0 # Multiply by the current row number
sub t1, t1,1 # Subtract 1 to get odd numbers
# Print asterisks for the current row
li a1,1 # file descriptor (stdout)
li a2,'*' # character to print
li a3,1 # string length
li a7,64 # system call code for write
# Loop to print asterisks
la t2, newline # Load newline character address
print_asterisks:
ecall # Print asterisk
add t1, t1,-1 # Decrement asterisk count
bnez t1, print_asterisks # Loop until all asterisks are printed
# Move to the next row
la t2, newline # Load newline character address
ecall # Print newline
add t0, t0,1 # Increment row counter
j draw_diamond # Jump back to draw_diamond loop
draw_lower_diamond:
# Draw the lower part of the diamond
# (This part is similar to the upper part with a reversed loop)
# Exit the program
li a7,10 # system call code for exit
li a0,0 # exit status
ecall

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