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Showing content from https://en.cppreference.com/w/cpp/language/../io/c/puts.html below:

std::puts - cppreference.com

int puts( const char *str );

Writes every character from the null-terminated string str and one additional newline character '\n' to the output stream stdout, as if by repeatedly executing std::fputc.

The terminating null character from str is not written.

On success, returns a non-negative value

On failure, returns EOF and sets the error indicator (see std::ferror) on stdout.

The std::puts function appends the newline character to the output, while std::fputs function does not.

Different implementations return different non-negative numbers: some return the last character written, some return the number of characters written (or INT_MAX if the string was longer than that), some simply return a non-negative constant.

A typical cause of failure for std::puts is running out of space on the file system, when stdout is redirected to a file.

#include <cstdio>
 
int main()
{
    int rc = std::puts("Hello World");
 
    if (rc == EOF)
        std::perror("puts()"); // POSIX requires that errno is set
}

Output:

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