Why <time.h> is used in coin toss guessing program

Question

Does <time.h > has any relation with the program, what is the key in toss=rand() %2, actually it shows rand() not declared

Answer 1

Well, can you please write and send the code SIR.....

Answer 2

There should be srand(time(0)) call that uses the current time to initialize the random number pattern.