random.cpp

产生一个随机数

#include"random.h"
#include <stdlib.h>
#include <stdio.h>
#include <time.h>


random::random()
{
	srand( (unsigned)time( NULL ) );
	seed= rand() ;
}
random::refresh()
{
	srand( (unsigned)time( NULL ) );
	seed= rand() ;
}

unsigned short random::randomInteger()
{
   const long multiplier=44449;
   const long adder=649801;

   seed=(multiplier*seed+adder)%31637687;
   return seed;
}
double random::randomReal()
{
   double dseed=randomInteger();
   return dseed/65536.0;
}
double random::between(double low,double high)
{
   return low+(high-low)*randomReal();
}
int random::between(int low,int high)
{
   return low +randomInteger()%(high-low+1);
}