Question

What will be occurred in this lines of code :

char Message[10];
scanf("%s%*",&Message,'?');

Why it reads two lines and then it will igonre the second line ?

It gives me first line as output when i use

`printf("%s",Message)` 

Answer 1

See scanf reference: An asterisk prefix to a type (i.e. a “%*[type]” format string, where [type] is a scanf type specifier, e.g. d or s) means that the value read is to be ignored; so the ‘?’ parameter is actually just there as a “placeholder”, to indicate that scanf will read two values.

The format string shown in the question (“%*”) is, however, invalid (it is missing the type specifier), meaning that the shown call will result in undefined behavior.