When do we use goto *expr; in C?

Question

| GOTO '*' expr ';'

I've never see such statements yet,anyone can bring an example?

Answer 1

This is so called Labels as Values and represents one of the GCC extensions.

---

As an example, I've applied this extension to give an answer to Printing 1 to 1000 without loop or conditionals question:

void printMe () 
{
    int i = 1;
    startPrintMe:
    printf ("%d\n", i);
    void *labelPtr = &&startPrintMe + (&&exitPrintMe - &&startPrintMe) * (i++ / 1000);
    goto *labelPtr;
    exitPrintMe:
}