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Showing content from https://www.cplusplus.com/reference/cstdio/puts/ below:

function

puts

int puts ( const char * str );

Write string to stdout

Writes the C string pointed by str to the standard output (stdout) and appends a newline character ('\n').

The function begins copying from the address specified (str) until it reaches the terminating null character ('\0'). This terminating null-character is not copied to the stream.

Notice that puts not only differs from fputs in that it uses stdout as destination, but it also appends a newline character at the end automatically (which fputs does not).

Parameters

str: C string to be printed.

Return Value On success, a non-negative value is returned.
On error, the function returns EOF and sets the error indicator (ferror).

Example

/* puts example : hello world! */
#include <stdio.h>

int main ()
{
  char string [] = "Hello world!";
  puts (string);
}