The **`puts` function** in C is used to write a line or string to the output stream (**`stdout`**) that is up to, but does not include, the `null` character. The `puts` function also appends a newline character to the output and returns an integer.

To use the `puts` function, you need to include the **`<stdio.h>`** library in the program. This is shown below:

```C
#include <stdio.h>
```
The prototype of the `puts` function is shown below:

```C
int puts(const char* str);
```



# Parameters

The `puts` function takes a single mandatory parameter, i.e., a null-terminated character array.

# Return Value

The `puts` function writes the provided argument to the output stream and appends a newline character at the end.

If the execution is successful, the function returns a non-negative integer; otherwise, it returns an **`EOF`** (End-of-File) for any error.

# Example

The code below shows how the `puts` function works in C:

#include <stdio.h>
#include <string.h>

int main() {
 
  // initializing strings
  char str1[] = "Hello World";
  char str2[] = "Using puts in C";

  // writing to stdout
  puts(str1);
  puts(str2);

  return 0;
}

# Explanation

First, two character arrays (**`str1`** and **`str2`**) are initialized. These arrays are then provided as arguments to the `puts` function called on **Lines 11 and 12**.

The `puts` function proceeds to write the contents of the strings to `stdout` and appends a newline character to each string. As a result, each string is printed on a separate line.

  

What is puts in C?

The puts function in C writes a string to stdout, appends a newline, and returns an integer.