> For the complete documentation index, see [llms.txt](https://42-guide.gitbook.io/42-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://42-guide.gitbook.io/42-guide/piscine-life/rushes/rush00/01.md).

# 01

#### **Code Structure Explanation**

1. **Printing characters (`ft_putchar`)**: This function handles single-character printing.
2. **First and Last Row (`first_line`, `last_row`)**:
   * Prints **first row** with `/` at the start and `\` at the end.
   * Prints **last row** with `\` at the start and `/` at the end.
   * Middle characters (`*`) are filled when width is more than 1.
3. **Middle Rows (`middle_rows`)**:
   * Uses `*` for left and right edges.
   * Fills spaces inside for widths greater than 1.
4. **Main Control Function (`display_chars`)**:
   * Calls `first_line`, `middle_rows`, and `last_row` in order.
5. **Main Function (`main`)**:
   * Calls `display_chars(5,1)` to print a test rectangle.

Code explanation

#### **1. Printing a Single Character (`ft_putchar`)**

```c
#include <unistd.h> // Includes write function for output

// Function to print a single character to standard output
void	ft_putchar(char c)
{
	write(1, &c, 1); // Writes character 'c' to standard output
}
```

✅ **Explanation:**

* `write(1, &c, 1);` → Writes the character `c` to the terminal.
* Used throughout the program to print individual characters.

#### **2. Handling the Last Character of a Line (`last_slash`)**

```c
// Function to handle the last character of the first and last row
void	last_slash(int a)
{
	if (a == 1) // If 'a' is 1, print '/' and move to a new line
	{
		ft_putchar('/');
		ft_putchar('\n');
	}
	else // Otherwise, print '\' and move to a new line
	{
		ft_putchar('\\');
		ft_putchar('\n');
	}
}
```

✅ **Explanation:**

* This function prints either `/` or `\` based on the parameter `a` and moves to a new line.
* **Used in the first and last rows** of the rectangle to ensure correct corner placement.

#### **3. Printing the First Row (`first_line`)**

```c
// Function to print the first row of the rectangle
void	first_line(int a)
{
	int	i;

	i = 0;
	if (a == 1) // If width is 1, just print '/' and return
	{
		last_slash(1);
	}
	while (i <= (a - 1) && a != 1) // Loop through characters in the first row
	{
		if (i == 0) // Print '/' as the first character
		{
			ft_putchar('/');
			i++;
		}
		if (i < (a - 1)) // Print '*' for the middle characters
		{
			ft_putchar('*');
			i++;
		}
		if (i == (a - 1)) // Print '\' as the last character
		{
			last_slash(2);
			i++;
		}
	}
}
```

✅ **Explanation:**

* Prints the **first row** of the rectangle.
* Starts with `/`, fills the middle with `*`, and ends with `\`.
* If width is **1**, only prints `/` (handled by `last_slash(1)`).

***

#### **4. Printing the Last Row (`last_row`)**

```c
// Function to print the last row of the rectangle
void	last_row(int a)
{
	int	i;

	i = 0;
	if (a == 1 && i == 0) // If width is 1, print '\' and return
	{
		last_slash(2);
	}
	while (i <= (a - 1) && a != 1) // Loop through characters in the last row
	{
		if (i == 0) // Print '\' as the first character
		{
			ft_putchar('\\');
			i++;
		}
		if (i < (a - 1)) // Print '*' for the middle characters
		{
			ft_putchar('*');
			i++;
		}
		if (i == (a - 1)) // Print '/' as the last character
		{
			last_slash(1);
			i++;
		}
	}
}
```

✅ **Explanation:**

* Similar to `first_line()`, but starts with `\` and ends with `/`.
* If width is **1**, only prints `\` (handled by `last_slash(2)`).

***

#### **5. Printing the Middle Rows (`middle_rows`)**

```c
// Function to print the middle rows of the rectangle
void	middle_rows(int a, int b)
{
	int	i;
	int	j;

	i = 0;
	j = 0;
	while (j < (b - 1)) // Loop through each middle row
	{
		if (i == 0 && a != 1) // Print '*' as the first character
		{
			ft_putchar('*');
			i++;
		}
		while (i < (a - 1)) // Print spaces in between
		{
			ft_putchar(' ');
			i++;
		}
		if (i == (a - 1) || i == 0) // Print '*' as the last character and move to the next line
		{
			ft_putchar('*');
			ft_putchar('\n');
			j++; // Move to the next row
			i = 0; // Reset `i` for the next row
		}
	}
}
```

✅ **Explanation:**

* Prints the **middle rows** of the rectangle.
* Uses `*` for the left and right edges.
* Fills spaces inside when width is greater than **1**.
* Loops through `b - 1` times (excluding the first and last row).

***

#### **6. Controlling the Printing Process (`display_chars`)**

```c
// Function to generate the rectangle and call respective functions
void	display_chars(int a, int b)
{
	first_line(a); // Print the first row
	middle_rows(a, (b - 1)); // Print middle rows
	last_row(a); // Print the last row
}
```

✅ **Explanation:**

* Calls the **three row functions** in order:
  1. `first_line(a)`: Prints the top row.
  2. `middle_rows(a, b - 1)`: Prints the middle rows (if height > 2).
  3. `last_row(a)`: Prints the bottom row.
* Ensures the correct sequence of printing.

***

#### **7. Main Function (`main`)**

```c
// Main function to test the implementation
int	main(void)
{
	display_chars(5, 1); // Calls the function with width = 5, height = 1
	return (0);
}
```

✅ **Explanation:**

* Calls `display_chars(5,1)` to **generate a rectangle of width 5 and height 1**.
* You can change values to test different rectangle sizes.

***

### **Summary of Functions and Responsibilities**

| Function Name     | Responsibility                                                 |
| ----------------- | -------------------------------------------------------------- |
| `ft_putchar()`    | Prints a single character                                      |
| `last_slash()`    | Prints `/` or `\` at the correct position                      |
| `first_line()`    | Prints the first row                                           |
| `last_row()`      | Prints the last row                                            |
| `middle_rows()`   | Prints the middle rows with `*` on the sides and spaces inside |
| `display_chars()` | Calls all the row functions in order                           |
| `main()`          | Starts the program and calls `display_chars()`                 |


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