Minor rewrites.

bitutilities.py

@@ -67,8 +67,8 @@ def get_memory(variable_name: str) -> list[bool]:
             print(f"[ERROR] The {variable_name} may contain only 1-s and 0-s!")
 
 
-def binary_sum(first_term: BasicRegister, second_term: BasicRegister, return_remainder: bool = False)\
-        -> BasicRegister | tuple[BasicRegister, int]:
+def binary_sum(first_term: BasicRegister, second_term: BasicRegister, return_remainder: bool = False) \
+        -> BasicRegister or tuple[BasicRegister, int]:
     """
     Sums two registers' values.
 
@@ -79,30 +79,47 @@ def binary_sum(first_term: BasicRegister, second_term: BasicRegister, return_rem
     :return: Register containing the sum or the tuple containing the register and carried radix.
     :rtype: BasicRegister | tuple[BasicRegister, int]
     """
-    size_a = len(first_term)
-    size_b = len(second_term)
-
-    required_size = max(size_a, size_b)
-
-    a = first_term
-    b = second_term
-
-    if size_a != size_b:
-        a = a.adjusted_by_size(required_size)
-        b = b.adjusted_by_size(required_size)
-
-    c = BasicRegister([False] * required_size)
+    result = BasicRegister([False] * len(first_term))
 
     carry = False
-    for i in range(required_size - 1, 0, -1):
-        current_bit_sum = a.memory[i] + b.memory[i] + carry
+    for i in range(len(first_term) - 1, 0, -1):
+        current_bit_sum = first_term.memory[i] + second_term.memory[i] + carry
         carry = bool(current_bit_sum & 2)
-        c.memory[i] = bool(current_bit_sum & 1)
+        result.memory[i] = bool(current_bit_sum & 1)
 
-    final_bit_sum = a.memory[0] + b.memory[0] + carry
-    c.memory[0] = bool(final_bit_sum & 1)
+    final_bit_sum = first_term.memory[0] + second_term.memory[0] + carry
+    result.memory[0] = bool(final_bit_sum & 1)
 
     if return_remainder:
-        return c, carry
+        final_carry = bool(final_bit_sum & 2)
+        return result, final_carry
     else:
-        return c
+        return result
+
+
+def binary_subtraction(first_term: BasicRegister, second_term: BasicRegister) -> BasicRegister:
+
+    second_term.reverse()
+
+    result: BasicRegister
+    final_carry: bool
+    result, final_carry = binary_sum(first_term, second_term, True)
+
+    if final_carry:
+        return binary_sum(result, BasicRegister([True] * len(result)))
+    else:
+        result.reverse()
+        return result
+
+
+def align_registers(first_register: BasicRegister, second_register: BasicRegister) \
+        -> tuple[BasicRegister, BasicRegister]:
+    first_size = len(first_register)
+    second_size = len(second_register)
+
+    required_size = max(first_size, second_size)
+
+    if first_size != second_size:
+        return first_register.adjusted_by_size(required_size), second_register.adjusted_by_size(required_size)
+    else:
+        return first_register, second_register

main.py

@@ -1,31 +1,32 @@
 import bitutilities as bu
-import timeit
+
+
+def input_handler(first_register: bu.BasicRegister, second_register: bu.BasicRegister):
+    first_register, second_register = bu.align_registers(first_register, second_register)
+
+    print()
+    print(first_register)
+    print(second_register)
+
+    while True:
+        print()
+        match input("Choose the operation:\n[a]ddition, [s]ubtraction, [m]ultiplication, [d]ivision, [q]uit\n>>> "):
+            case "a":
+                print(f"Sum:\n{bu.binary_sum(first_register, second_register)}")
+            case "s":
+                print(f"Subtraction:\n{bu.binary_subtraction(first_register, second_register)}")
+            case "m":
+                pass
+            case "d":
+                pass
+            case "q":
+                exit()
+            case _:
+                print("Not an available operation, try again.")
 
 
 if __name__ == '__main__':
     reg: bu.BasicRegister = bu.BasicRegister(bu.get_memory("memory"))
-
-    print()
-    print("Register 1:")
-    print(reg)
-
-    print()
     reg2: bu.BasicRegister = bu.BasicRegister(bu.get_memory("more memory"))
 
-    print()
-    print("Register 2:")
-    print(reg2)
-
-    print()
-    reg3: bu.BasicRegister = bu.binary_sum(reg, reg2)
-
-    print()
-    print("Sum:")
-    print(reg3)
-
-    carry_sum_test: tuple[bu.BasicRegister, int] = bu.binary_sum(reg, reg2, True)
-
-    print()
-    print("Sum & carry:")
-    # print(type(carry_sum_test))
-    print(carry_sum_test)
+    input_handler(reg, reg2)