> 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/c01/ft_swap.md).

# ft\_swap

**Objective:**

Create a function that swaps the values of two integers using their addresses (pointers).

**Turn-in Requirements:**

* **Directory**: `ex02/`
* **File**: `ft_swap.c`
* **Allowed Functions**: None

**Prototype:**

```c
void ft_swap(int *a, int *b);
```

**Implementation:**

Here’s how you can implement the function:

```c
// File: ft_swap.c
#include <unistd.h> // Optional, not needed for this task but can be standard practice for headers

void ft_swap(int *a, int *b)
{
    int temp;

    temp = *a;  // Store the value of *a in a temporary variable
    *a = *b;    // Assign the value of *b to *a
    *b = temp;  // Assign the stored value (temp) to *b
}
```

**Explanation:**

1. **Input Pointers**:
   * The function accepts two pointers, `a` and `b`, which point to integers in memory.
2. **Swapping Values**:
   * A temporary variable (`temp`) is used to store the value of `*a`.
   * The value of `*b` is then assigned to `*a`.
   * Finally, the temporary variable (`temp`) is assigned to `*b`.

**Example Usage:**

```c
#include <stdio.h>

void ft_swap(int *a, int *b);

int main()
{
    int x = 5;
    int y = 10;

    printf("Before swap: x = %d, y = %d\n", x, y);
    ft_swap(&x, &y); // Pass the addresses of x and y
    printf("After swap: x = %d, y = %d\n", x, y);

    return 0;
}
```

**Output:**

```mathematica
Before swap: x = 5, y = 10
After swap: x = 10, y = 5
```

**Notes:**

* The function uses pointers to modify the original variables directly.
* Always ensure the pointers passed to the function are valid and not `NULL`.


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