what is srand function?give me an example of its usage

Answer 1

it gives a seed random number

srand(time(NULL);

this use the time to give random number

Answer 2

As most of us know that when we generate a random number by using "rand()" it'll always give us the same numbers over and over.
By using "srand()" we get a random number but we should change the values inside the brackets of the srand.
So our final solution to generate a random number without the need of changing the values inside the srand's brackets each time we use "time(0 or null)" inside the srand's brackets. This will generate random numbers every time we run our program.