32 lines
494 B
C
32 lines
494 B
C
|
#include <stddef.h>
|
||
|
|
|
||
|
|
static unsigned int seed = 0;
|
||
|
|
|
||
|
|
void srand(unsigned int _seed)
|
||
|
|
{
|
||
|
|
seed = _seed;
|
||
|
|
}
|
||
|
|
|
||
|
|
int rand(void)
|
||
|
|
{
|
||
|
|
int next = seed;
|
||
|
|
int result;
|
||
|
|
|
||
|
|
next *= 1103515245;
|
||
|
|
next += 12345;
|
||
|
|
result = (int)(next / 65536) % 2048;
|
||
|
|
|
||
|
|
next *= 1103515245;
|
||
|
|
next += 12345;
|
||
|
|
result <<= 10;
|
||
|
|
result ^= (int)(next / 65536) % 1024;
|
||
|
|
|
||
|
|
next *= 1103515245;
|
||
|
|
next += 12345;
|
||
|
|
result <<= 10;
|
||
|
|
result ^= (int)(next / 65536) % 1024;
|
||
|
|
|
||
|
|
seed = next;
|
||
|
|
return result;
|
||
|
|
}
|