Code Bot compiler - Online Compiler NASM 32. This code reads a chessboard position (column letter A-H and row digit 1-8), then calculates and prints a value based on the position using arithmetic operations.

Online Compiler Nasm

extern io_get_char, io_print_udec, io_newline section .text global main main: ; Read column letter (A-H) call io_get_char mov ebx, eax ; ebx = column letter ; Read row digit (1-8) call io_get_char mov ecx, eax ; ecx = row digit ; Convert column: 'A'->1, 'B'->2, ..., 'H'->8 sub ebx, 'A' add ebx, 1 ; ebx = column (1-8) ; Convert row: '1'->1, '2'->2, ..., '8'->8 sub ecx, '0' ; ecx = row (1-8) ; Your original algorithm continues here... mov eax, 8 sub eax, ebx ; eax = 8 - col (columns to the right) mov edx, 8 sub edx, ecx ; edx = 8 - row (rows above) imul eax, edx ; eax = total cells in rectangle add ebx, 1 add ecx, 1 add ebx, ecx and ebx, 1 ; ebx = parity add eax, ebx shr eax, 1 ; divide by 2 call io_print_udec call io_newline xor eax, eax ret

1) This code reads a chessboard position (column letter A-H and row digit 1-8), then calculates and prints a value based on the position using arithmetic operations.

2) Hint: The algorithm calculates the number of certain chessboard squares. Try tracing through the arithmetic with a specific input like "A1" or "H8" to understand the pattern.
Hint: The `and ebx, 1` instruction checks whether the sum (col+1 + row+1) is odd or even, which relates to the color of the chess square.