Updates

app.py

@@ -3,7 +3,6 @@ import importlib
 import logging
 from fpdf import FPDF
 import uuid
-import json
 
 # Configure logging
 logging.basicConfig(level=logging.INFO)
@@ -144,11 +143,16 @@ def get_option_style(option):
             return "background-color:#f8d7da;padding:10px;border-radius:5px;"  # Red background for incorrect
     return "background-color:#f0f0f0;padding:10px;border-radius:5px;"  # Gray background by default
 
+def format_option(option, option_style):
+    return f"<label style='{option_style}'>{option}</label>"
+
+# Display options with custom formatting
 selected_answer = st.radio(
-    "Choose an answer:", 
-    current_question['options'], 
-    index=current_question['options'].index(current_question.get('selected', '')) if current_question.get('selected') else None, 
-    key=st.session_state.current_index
+    "Choose an answer:",
+    options=[format_option(option, get_option_style(option)) for option in current_question['options']],
+    format_func=lambda x: x,
+    key=st.session_state.current_index,
+    label_visibility="collapsed",
 )
 
 if st.button("Submit"):
@@ -161,13 +165,4 @@ if st.button("Submit"):
             st.session_state.correct_count += 1
             st.session_state.module_correct_count[module_name] += 1
 
-# Retain and highlight the options after submission
-for option in current_question['options']:
-    st.markdown(f"<div style='{get_option_style(option)}'>{option}</div>", unsafe_allow_html=True)
-
-# Show explanation and step-by-step solution
-if current_question.get('answered', False):
-    st.write(f"**Explanation:** {current_question['explanation']}")
-    st.write("**Step-by-Step Solution:**")
-    for step in current_question['step_by_step_solution']:
-        st.write(step)
+# Since we're not adding an additional section, remove any content below the options.

modules/valid_invalid_numbers.py

@@ -8,23 +8,33 @@ def generate_question():
         return ''.join([str(random.randint(0, base - 1)) for _ in range(length)])
 
     def generate_invalid_number():
-        valid_digits = ''.join([str(random.randint(0, base - 1)) for _ in range(length - 1)])
-        invalid_digit = str(random.randint(base, 9))
-        return valid_digits + invalid_digit
+        if base <= 9:
+            valid_digits = ''.join([str(random.randint(0, base - 1)) for _ in range(length - 1)])
+            invalid_digit = str(random.randint(base, 9))
+            return valid_digits + invalid_digit
+        else:
+            # For bases higher than 9 (base 10 and base 16), generate an invalid number differently.
+            valid_digits = [str(random.randint(0, base - 1)) for _ in range(length - 1)]
+            invalid_digit = chr(random.randint(65, 70))  # Use A-F for invalid hex digits
+            valid_digits[random.randint(0, length - 2)] = invalid_digit
+            return ''.join(valid_digits)
 
     correct_answer = generate_invalid_number()
     options = [correct_answer] + [generate_valid_number() for _ in range(3)]
+    random.shuffle(options)
+
+    steps = [
+        f"Check if all digits are within the valid range for base {base}.",
+        f"In base {base}, valid digits are 0 to {base-1}.",
+        f"The number {correct_answer} contains a digit outside this range, so it is invalid."
+    ]
 
     question_data = {
         "question": f"Which of the following is an invalid number in base {base}?",
         "options": options,
         "correct_answer": correct_answer,
         "explanation": f"The number {correct_answer} is invalid in base {base} because it contains a digit outside the range 0-{base-1}.",
-        "step_by_step_solution": [
-            "1. Identify the valid digits for the base.",
-            f"2. Check each option to see if it contains any invalid digits (greater than {base-1}).",
-            "3. The correct answer will have a digit that is not allowed in the specified base."
-        ]
+        "step_by_step_solution": steps
     }
 
     return question_data