scanf and space character

[zio_mangrovia]

Why scanf cannot read space character?
I need to read my name and surname by stdin into the same array, so I thought to use :

char completename[50];
scanf("%s", completename);

Someone suggested me fgets, why scanf cannot read space character?

[2kaud]

Is this c# or c ??

If c, then by definition %s used with scanf reads a string until a white-space char is encountered. If you want to read the whole line until a '\n' then since c11 use get_s(). See:
https://en.cppreference.com/w/c/io/fscanf
https://en.cppreference.com/w/c/io/gets