c說話隨機數函數示例

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void srand( unsigned int seed );
head file is <stdlib.h>
Remarks
The srand function sets the starting point for generating a series of pseudorandom
integers. To reinitialize the generator, use 1 as the seed argument. Any other value for
seed sets the generator to a random starting point. rand retrieves the pseudorandom
numbers that are generated. Calling rand before any call to srand generates the same
sequence as calling srand with seed passed as 1.


#include <stdlib.h>
#include <stdio.h>
#include <time.h>
void main( void )
{
   int i;
   /* Seed the random-number generator with current time so that
    * the numbers will be different every time we run.
    */
   srand((unsigned)time(NULL));
   /* Display 10 numbers. */
   for( i = 0;   i < 10;i++ )
      printf("  %6d\n", rand());
}