by Dinesh Thakur Category: Function and Pointer

In many cases and particularly in computer games, a seed number cannot be provided on every event. We need some function whose return value is always changing. Time is always changing; so, we make use of function time() defined in the header file <time.h>.

The function time (Null)gives a number which is equal to the number of seconds elapsed till now since 1st January 1970 Greenwich time 00:00:00. This number is always changing. The problem of using a different number as seed number is solved by the following code:

long unsigned seed.= time(Null);

srand (seed);

Or we may use the following code:

srand (time(Null));

Program  uses srand (time (Nu11)); as well as displays the value of seed number.


#include <time.h>
  int n;
  long unsigned seed;
  seed= time(NULL);
  srand (seed);
  printf("seed = %d\n", seed);
  printf("The random numbers are as below.\n");
  for (n=1;n<7;n++)
  printf("%d\t", rand())
  printf ("\n");
  return 0;

The expected output is as given below.

    C Program use of time() as seed number

About Dinesh Thakur

Dinesh ThakurDinesh Thakur holds an B.C.A, MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to Contact us.

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