rand0.c

c primer plus 第五版 的源代码

/* rand0.c -- produces random numbers            */
/*               uses ANSI C portable algorithm  */
static unsigned long int next = 1;  /* the seed  */

int rand0(void)
{
/* magic formula to generate pseudorandom number */
     next = next * 1103515245 + 12345;   
     return (unsigned int) (next/65536) % 32768;
}