dot operator before member variable

[Time]

hi,
I have seen . operator used while defining structure before name of variable?
ex.
struct usb_driver stub_driver = {
.name = "usbip",
.probe = stub_probe,
.disconnect = stub_disconnect ,
.id_table = stub_table,
};
What is that, does someone know?

[Banfa]

Not in standard C89 or C++ you haven't.

This is a part of the C99 standard and it allows you to specifically initialise members of a structure, all other members of the structure are initialised to 0.

The . is just part of the syntax for this type of initialisaer and comes before the structure member name.

[Time]

But then what is the type of those variables?....d ata type?? char,float,int? ?
Is it the case that it takes its type according to initialized value of it?

[newb16]

No , their types are already specified in struct usb_driver structure.