> 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_putstr.md).

# ft\_putstr

**Objective:**

Create a function that displays a string of characters on the standard output.

**Turn-in Requirements:**

* **Directory**: `ex05/`
* **File**: `ft_putstr.c`
* **Allowed Functions**: `write`

**Prototype:**

```c
void ft_putstr(char *str);
```

**Implementation:**

Here’s how you can implement the function:

```c
// File: ft_putstr.c
#include <unistd.h>

void ft_putstr(char *str)
{
    int i = 0;

    while (str[i] != '\0') // Iterate through the string until the null terminator
    {
        write(1, &str[i], 1); // Write each character to standard output
        i++;
    }
}
```

**Explanation:**

1. **Input**:
   * The function takes a pointer to a character (`char *str`) representing the string to be displayed.
2. **Output**:
   * It uses the `write` system call to output characters one by one to the standard output (`1`).
3. **Loop**:
   * The loop continues until the null terminator (`'\0'`) is encountered, indicating the end of the string.

**Example Usage:**

```c
#include <unistd.h>

void ft_putstr(char *str);

int main()
{
    ft_putstr("Hello, 42!\n"); // Prints "Hello, 42!" followed by a newline
    return 0;
}
```

**Output:**

```
Hello, 42!
```

**Notes:**

* The function does not handle `NULL` strings. If you want, you can add a check to avoid passing `NULL`:

  ```c
  if (!str) return;
  ```
* This exercise helps you understand how to work with strings and interact with system-level output.


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