[转]windows下srand48()和drand48()的问题

转自：windows下srand48()和drand48()的问题

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 #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