std::gets (3) - Linux Manuals
Defined in header <cstdio>
char* gets( char* str ); (deprecated in C++11)
Reads stdin into given character string until a newline character is found or end-of-file occurs.
str - character string to be written
str on success, NULL on failure.
If the failure has been caused by end of file condition, additionally sets the eof indicator (see std::feof()) on stdin. If the failure has been caused by some other error, sets the error indicator (see std::ferror()) on stdin.
The function provides no means to prevent buffer overflow of the destination array, given sufficiently long input string. std::gets was deprecated in C++11 and removed from C++14.
std::fgets can be used instead.
scanf reads formatted input from stdin, a file stream or a buffer