moved from todo to current features in readme

README.md

@@ -8,9 +8,9 @@ https://www.pgonline.co.uk/resources/computer-science/a-level-ocr/ocr-a-level-te
  - Conversions between bases (integers)<br/>
  - Binary addition<br/>
  - Floating point binary to denery conversion<br/>
+ - Two's complement<br/>
 
  # TODO
-  - Two's complement<br/>
   - Sign and magnitude<br/>
   - Complex binary* <br/>
 

bases-game.py

@@ -19,8 +19,35 @@ while True:
     Floating point binary
     Twos compliment, Sign & Magnitude, Complex binary
     '''
-    type_int = random.randint(0,2)
+    type_int = random.randint(0,3)
     
+    if type_int == 3:
+        start_base = random.randint(0,1)
+        positive_int = random.randint(0,127)
+        negative_int = 0 - positive_int
+        positive_bin = format(positive_int, '#010b')[2:]
+        negative_bin = ""
+        for x in positive_bin:
+            if x == "0":
+                negative_bin += "1"
+            else:
+                negative_bin += "0"
+
+        negative_bin = bin(int(negative_bin,2) + 1)[2:]
+        if (start_base == 0): # Binary -> Denery
+            print("\nWhat does this two's compliment number represent in base 10?\n")
+            print(negative_bin) 
+            answer = str(negative_int)
+        elif (start_base == 1): # Denery -> Binary
+            print("\nWhat does this negative number represent in base 2 (two's compliment)\n")
+            print(negative_int)
+            answer = str(negative_bin)
+
+        attempt = input()
+        if attempt == answer:
+            correct()
+        else:
+            print(f"No, the answer was {answer}")
     if type_int == 2:
         print("What is this binary floating point number in denery?\n")
         int_length = random.randint(0,7)