Fix lesson content quality: malformed markdown, missing/incomplete answer keys

lessons/c-c++/.archive/stage-2-original-20251105/level-1/lesson.md

@@ -26,7 +26,7 @@ Welcome to Stage 2!  You've mastered copying code - now it's time to think like
 **Pseudocode** is a way to write programming logic in plain English (or your native language) before writing actual code. It's like writing a recipe or instructions for a task.
 
 **Example:**
-```bash
+```
 Algorithm: Make a sandwich
 1. Get bread from pantry
 2. Get peanut butter from fridge
@@ -35,7 +35,7 @@ Algorithm: Make a sandwich
 5. Spread jelly on the other bread slice
 6. Put slices together
 7. Enjoy your sandwich!
-```bash
+```
 
 This is much easier to understand than trying to write code first!
 
@@ -50,13 +50,13 @@ This is much easier to understand than trying to write code first!
 ## Algorithm 1: Greeting Program
 
 **Pseudocode:**
-```bash
+```
 Algorithm: Display Personal Greeting
 1. Display "Hello! What's your name?" to the user
 2. Get the user's name from input
 3. Display "Nice to meet you, " followed by the user's name
 4. Display "Welcome to programming!"
-```bash
+```
 
 **Your Task:** Create a C program that follows these exact steps.
 
@@ -65,15 +65,15 @@ Algorithm: Display Personal Greeting
 ## Algorithm 2: Simple Calculator
 
 **Pseudocode:**
-```bash
+```
 Algorithm: Add Two Numbers
 1. Ask user for first number
 2. Get first number from user
 3. Ask user for second number
 4. Get second number from user
 5. Calculate sum of the two numbers
 6. Display "The sum is: " followed by the sum
-```bash
+```
 
 **Your Task:** Create a C program that implements this calculator.
 
@@ -82,14 +82,14 @@ Algorithm: Add Two Numbers
 ## Algorithm 3: Age Calculator
 
 **Pseudocode:**
-```bash
+```
 Algorithm: Calculate Age in Days
 1. Display "Enter your age in years: "
 2. Get age in years from user
 3. Calculate days = age × 365
 4. Display "You are approximately " + days + " days old"
 5. Display "That's a lot of days! "
-```bash
+```
 
 **Your Task:** Create a program that calculates approximate age in days.
 
@@ -98,7 +98,7 @@ Algorithm: Calculate Age in Days
 ## Algorithm 4: Temperature Converter
 
 **Pseudocode:**
-```bash
+```
 Algorithm: Celsius to Fahrenheit Converter
 1. Display "Enter temperature in Celsius: "
 2. Get temperature in Celsius from user
@@ -107,7 +107,7 @@ Algorithm: Celsius to Fahrenheit Converter
 5. Display "°C = "
 6. Display the Fahrenheit temperature
 7. Display "°F"
-```bash
+```
 
 **Your Task:** Create a temperature conversion program.
 
@@ -116,7 +116,7 @@ Algorithm: Celsius to Fahrenheit Converter
 ## Algorithm 5: Rectangle Area Calculator
 
 **Pseudocode:**
-```bash
+```
 Algorithm: Calculate Rectangle Area
 1. Display "Rectangle Area Calculator"
 2. Display "Enter length: "
@@ -127,7 +127,7 @@ Algorithm: Calculate Rectangle Area
 7. Calculate perimeter = 2 × (length + width)
 8. Display "Area: " + area
 9. Display "Perimeter: " + perimeter
-```bash
+```
 
 **Your Task:** Create a program that calculates both area and perimeter.
 
@@ -136,7 +136,7 @@ Algorithm: Calculate Rectangle Area
 ## Algorithm 6: Simple Interest Calculator
 
 **Pseudocode:**
-```bash
+```
 Algorithm: Calculate Simple Interest
 1. Display "Simple Interest Calculator"
 2. Display "Enter principal amount: $"
@@ -150,7 +150,7 @@ Algorithm: Calculate Simple Interest
 10. Display "Principal: $" + principal
 11. Display "Interest: $" + interest
 12. Display "Total: $" + total
-```bash
+```
 
 **Your Task:** Implement the complete interest calculation.
 
@@ -211,7 +211,7 @@ Algorithm: Calculate Simple Interest
 ## Pseudocode Best Practices
 
 ### Good Pseudocode
-```bash
+```
 Algorithm: Process User Data
 1. Get user's name
 2. Get user's age
@@ -220,18 +220,18 @@ Algorithm: Process User Data
 Else
    Display "Minor user"
 4. Display "Data processed"
-```bash
+```
 
 ### Bad Pseudocode (Too Vague)
-```bash
+```
 Algorithm: Do stuff
 1. Get things
 2. Calculate something
 3. Show results
-```bash
+```
 
 ### Good Pseudocode (Clear and Specific)
-```bash
+```
 Algorithm: Calculate BMI
 1. Display "BMI Calculator"
 2. Display "Enter weight in kg: "
@@ -240,7 +240,7 @@ Algorithm: Calculate BMI
 5. Get height from user
 6. Calculate BMI = weight ÷ (height × height)
 7. Display "Your BMI is: " + BMI
-```bash
+```
 
 ---
 
@@ -266,7 +266,7 @@ int main() {
 
     return 0;
 }
-```bash
+```
 
 **Key Concepts:**
 - [ ] `char name[50];` - String variable to store the name
@@ -295,7 +295,7 @@ int main() {
 
     return 0;
 }
-```bash
+```
 
 **Key Concepts:**
 - [ ] Multiple variables: `num1`, `num2`, `sum`
@@ -322,7 +322,7 @@ int main() {
 
     return 0;
 }
-```bash
+```
 
 **Key Concepts:**
 - [ ] Simple multiplication: `age_days = age_years * 365;`
@@ -348,7 +348,7 @@ int main() {
 
     return 0;
 }
-```bash
+```
 
 **Key Concepts:**
 - [ ] `float` variables for decimal temperatures
@@ -380,7 +380,7 @@ int main() {
 
     return 0;
 }
-```bash
+```
 
 **Key Concepts:**
 - [ ] Multiple calculations: area and perimeter
@@ -416,7 +416,7 @@ int main() {
 
     return 0;
 }
-```bash
+```
 
 **Key Concepts:**
 - [ ] Complex formula: `(principal * rate * time) / 100`
@@ -471,28 +471,28 @@ int main() {
 int age;
 std::cout << "Enter age: ");
 scanf("%d", &age);
-```bash
+```
 
 **Getting Decimals:**
 ```c
 float price;
 std::cout << "Enter price: $");
 scanf("%f", &price);
-```bash
+```
 
 **Getting Text:**
 ```c
 char name[50];
 std::cout << "Enter name: ");
 scanf("%s", name);
-```bash
+```
 
 **Displaying Results:**
 ```c
 std::cout << "Result: %d\n", result);
 std::cout << "Price: $%.2f\n", price);
 std::cout << "Hello, %s!\n", name);
-```bash
+```
 
 ---
 
@@ -530,7 +530,7 @@ Key functions and their purpose:
 
 ### Complete Solution
 
-```cpp
+```
 #include <iostream>
 
 int main() {