Why do we use srand ((time (NULL))?

You need to under the concept and definition of function and you must visualize how does it work.Before going to srand, try to see subset of it, its rand1. rand -- provide random number generator (as its int, so range falls under 0 - 327672. srand - its "seed"random number - that means used to set the starting value (seed), for generating.So, its set seed(1) as default and on top of it rand() generates random number between seed and range <32 ,767>3. Time - is every changing at every second, just think if you are sending current time vallue as seed -> to srand (which initializes) -> inturn -> rand() get calls. Now, the range of random generation number is less.4. So instead of some static integer , as end user we want to supply, make use of the computer's internal clock to controlthe choice of the seed.Hope it helps. read less