# 6. More Migration Guide: From Python to C

### 6.1 Common Syntax Differences

| Feature | Python | C |
|---------|--------|---|
| **Comments** | `# This is a comment` | `// This is a comment` |
| **Block Comments** | `"""Multi-line"""` | `/* Multi-line */` |
| **Code Blocks** | Indentation | `{ }` braces |
| **Statement End** | Line break | `;` semicolon |
| **Boolean Values** | `True`, `False` | `1`, `0` (or `true`, `false` with `<stdbool.h>`) |

### 6.2 Variable Declaration Migration

**Python to C Translation Examples:**

```python
# Python
age = 25
height = 5.9
name = "Alice"
is_student = True
```

```c
// C
int age = 25;
float height = 5.9f;
char name[] = "Alice";
int is_student = 1;  // or use bool with #include <stdbool.h>
```

### 6.3 Function Definition Migration (We will learn more about this on the next module)

**Python:**
```python
def calculate_area(length, width):
    return length * width

result = calculate_area(5, 3)
print(result)
```

**C:**
```c
#include <stdio.h>

// Function declaration (prototype)
int calculate_area(int length, int width);

int main() {
    int result = calculate_area(5, 3);
    printf("%d\n", result);
    return 0;
}

// Function definition
int calculate_area(int length, int width) {
    return length * width;
}
```

### 6.4 Common Pitfalls for Python Programmers

1. **Forgetting Semicolons:**
   ```c
   int x = 5  // ERROR: Missing semicolon
   int x = 5; // CORRECT
   ```

2. **Using = instead of == in conditions:**
   ```c
   if (x = 5) { ... }   // ERROR: Assignment, not comparison
   if (x == 5) { ... }  // CORRECT: Comparison
   ```

3. **Forgetting & in scanf():**
   ```c
   scanf("%d", x);   // ERROR: Missing &
   scanf("%d", &x);  // CORRECT
   ```

4. **Array Index Out of Bounds: (We will learn more about this on the next module)**
   ```c
   int arr[5];
   arr[5] = 10;  // ERROR: Index 5 is out of bounds (valid: 0-4)
   arr[4] = 10;  // CORRECT: Last valid index
   ```