Question

I figure using fgets is the best option, but apparently it takes input from stdin? How do I generate a random number using rand(), and store it?

Answer 1

You can use sprintf():

char buf[11];
int r = rand();
sprintf(buf, "%d", r);

A more robust option is to use snprintf() if your runtime library offers it:

snprintf(buf, sizeof(buf), "%d", r);

Using snprintf() in this way ensures that the resulting string will not overflow the bounds of buf.