def oct_to_dec(octal_num): decimal_num = 0 power = 0 while octal_num!= 0: digit = octal_num % 10 decimal_num += digit * (8 ** power) octal_num //= 10 power += 1 return decimal_num octal_number = int(input("请输入一个八进制正整数：")) print(oct_to_dec(octal_number))

31:31