[ARX程序]：如何得到一个随机数？

fastdev

如何用arx编制程序得到一个随机数？

fastdev

rand
Generates a pseudorandom number.

int rand( void );

Routine Required Header Compatibility
rand <stdlib.h> ANSI, Win 95, Win NT


For additional compatibility information, see Compatibility in the Introduction.

Libraries

LIBC.LIB Single thread static library, retail version
LIBCMT.LIB Multithread static library, retail version
MSVCRT.LIB Import library for MSVCRT.DLL, retail version


Return Value

rand returns a pseudorandom number, as described above. There is no error return.

Remarks

The rand function returns a pseudorandom integer in the range 0 to RAND_MAX. Use the srand function to seed the pseudorandom-number generator before calling rand.

Example

/* RAND.C: This program seeds the random-number generator
* with the time, then displays 10 random integers.
*/

#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() );
}


Output

    6929
    8026
   21987
   30734
   20587
    6699
   22034
   25051
    7988
   10104


Floating-Point Support Routines

See Also   srand

XDSoft

具体是什么应用？一般求系统时间，精确到毫秒，应该是个唯一值了。

fastdev

有一条pline线，我想在其上随机插入点，变成一条随机的扭来扭去的实体，所以我想找一个我每一次调用都会产生一个随机数的函数，最好我能控制其上限和下限，上面这个函数好像也不满足我的要求，还请赐教...:)