random函数实现C语言
2015-03-09 22:43
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#define ULONG_MAX ((unsigned long)(~0L)) /* 0xFFFFFFFF*/
#define LONG_MAX ((long)(ULONG_MAX >> 1))/* 0x7FFFFFFF*/
#define NULL (void *) 0
static long int RandomTable[32] ={ 3,
0x9a319039, 0x32d9c024, 0x9b663182, 0x5da1f342,
0xde3b81e0, 0xdf0a6fb5, 0xf103bc02, 0x48f340fb,
0x7449e56b, 0xbeb1dbb0, 0xab5c5918, 0x946554fd,
0x8c2e680f, 0xeb3d799f, 0xb11ee0b7, 0x2d436b86,
0xda672e2a, 0x1588ca88, 0xe369735d, 0x904f35f7,
0xd7158fd6, 0x6fa6f051, 0x616e6b96, 0xac94efdc,
0x36413f93, 0xc622c298, 0xf5a42ab8, 0x8a88d77b,
0xf5ad9d0e, 0x8999220b, 0x27fb47b9
};
static long int *fptr = &RandomTable[4];
static long int *rptr = &RandomTable[1];
static long int *state = &RandomTable[1];
static long int *end_ptr = &RandomTable[sizeof(RandomTable) / sizeof(RandomTable[0])];
long int my_random ()
{
long int i;
*fptr += *rptr;
i = (*fptr >> 1) & LONG_MAX;
fptr++;
if (fptr >= end_ptr)
{
fptr = state;
rptr++;
}
else
{
rptr++;
if (rptr >= end_ptr)
rptr = state;
}
return i;
}
void my_srandom (unsigned int seed)
{
state[0] = seed;
register long int i;
for (i = 1; i < 31; ++i)
state[i] = (1103515145 * state[i - 1]) + 12345;
fptr = &state[3];
rptr = &state[0];
for (i = 0; i < 10 * 31; ++i)
my_random();
}
#include <time.h>
int main()
{
int i;
my_srandom((unsigned)(time(NULL)));
for(i=0;i<100;i++)
{
if(i % 10 == 0)
printf("\n");
printf("%d\t",my_random()%99+1);
}
system("pause");
return 0;
}
#define LONG_MAX ((long)(ULONG_MAX >> 1))/* 0x7FFFFFFF*/
#define NULL (void *) 0
static long int RandomTable[32] ={ 3,
0x9a319039, 0x32d9c024, 0x9b663182, 0x5da1f342,
0xde3b81e0, 0xdf0a6fb5, 0xf103bc02, 0x48f340fb,
0x7449e56b, 0xbeb1dbb0, 0xab5c5918, 0x946554fd,
0x8c2e680f, 0xeb3d799f, 0xb11ee0b7, 0x2d436b86,
0xda672e2a, 0x1588ca88, 0xe369735d, 0x904f35f7,
0xd7158fd6, 0x6fa6f051, 0x616e6b96, 0xac94efdc,
0x36413f93, 0xc622c298, 0xf5a42ab8, 0x8a88d77b,
0xf5ad9d0e, 0x8999220b, 0x27fb47b9
};
static long int *fptr = &RandomTable[4];
static long int *rptr = &RandomTable[1];
static long int *state = &RandomTable[1];
static long int *end_ptr = &RandomTable[sizeof(RandomTable) / sizeof(RandomTable[0])];
long int my_random ()
{
long int i;
*fptr += *rptr;
i = (*fptr >> 1) & LONG_MAX;
fptr++;
if (fptr >= end_ptr)
{
fptr = state;
rptr++;
}
else
{
rptr++;
if (rptr >= end_ptr)
rptr = state;
}
return i;
}
void my_srandom (unsigned int seed)
{
state[0] = seed;
register long int i;
for (i = 1; i < 31; ++i)
state[i] = (1103515145 * state[i - 1]) + 12345;
fptr = &state[3];
rptr = &state[0];
for (i = 0; i < 10 * 31; ++i)
my_random();
}
#include <time.h>
int main()
{
int i;
my_srandom((unsigned)(time(NULL)));
for(i=0;i<100;i++)
{
if(i % 10 == 0)
printf("\n");
printf("%d\t",my_random()%99+1);
}
system("pause");
return 0;
}
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