Read about text objects in vim with :help text-objects

Text objects are basically direction macros for simple deletion/copy/changing. For instance, diB This will delete everything between the nearest { and closing }. That is:

static int update() {
	if (u) {
		printf("Update\n");
	} else {
		printf("No update\n";
	}
}

Paste the above code in vim. Put the cursor on the first printf (line 3) and, in command mode, do diB - undo that and try ciB. The d command will delete the code block, where as c will do the obvious and delete the code block and leave you in insert mode.

These text object direction things are quite neat. Again, check out the help page on it (:help text-objects). Neat little shortcuts.