Avoiding Repeated seed generation using srand()

Question

I have a typical situation where I need to generate a batch of random numbers. I have used a loop which generates 100 random numbers on each pass:

for(int i=0; i         


        

Answer 1

Keep srand out:

srand(time(NULL)); //Initialize seed
for(int i=0; i<npasses; i++)
{
   for(int j=0; j<100; j++)
      printf("%d ", rand()%10);

   printf("\n"); //New line after 100 numbers
}

Answer 2

try this

srand(clock()); //Initialize seed

Answer 3

You can use the random generator to generate a new seed.

For example:

srand((unsigned int)rand());

And use srand(time(NULL)) only once before the loop. But as suggested in another answer, you might as well drop the whole srand inside the loop as well.

Answer 4

Set the seed once, before the loop.