What dos this mean? (question about rand() and time)

[Ch1156]

I was watching a tutorial yesterday and i got this code which has helped me tremendiousley considering almost every program i want to build needs some randomizing.

    time_t T;
    time(&T);
    srand(T);

    int x;
    int y;

    for(int R = 0; R <1; ++R)
    {
        x = rand() % 10;
        y = rand() % 50;
    }

What is time_t???
why is & in front of T?
do i even need srand(T) there?

[ne555]

_In my case typedef long time_t;
_& will take the address of the operand.
time() comes from the C library, as you may know there were no references there. So in order to modify an argument you pass its address to the function.
_RTFM