#ifndef DRAND48_H

 #define DRAND48_H

 #include <stdlib.h>

 #define m 0x100000000LL

 #define c 0xB16

 #define a 0x5DEECE66DLL

 static unsigned long long seed = ;

 double drand48(void)

 {

     seed = (a * seed + c) & 0xFFFFFFFFFFFFLL;

     unsigned int x = seed >> ;

     return     ((double)x / (double)m);

 }

 void srand48(unsigned int i)

 {

     seed  = (((long long int)i) << ) | rand();

 }

 #endif