#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;
//产生随机数（浮点数），位于区间[a,b]或者[b,a]
double randDbl(double a,double b)
{
return a + static_cast<double>(rand())/RAND_MAX*(b-a);
}
//产生随机数（整数），位于区间[a,b]或者[b,a]
int randInt(int a, int b)
{
if(a<b)
return a + rand()%(b-a+1);
else if(a>b)
return b + rand()%(a-b+1);
else // a==b
return a;
}
int main(int argc, char *argv[])
{
int a=1, b=6;
double c=1.0, d=6.0;
srand(time(0)); //保证每次运行产生的随机数都不一样
//测试随机数的产生是否正确
for(int i=0; i<10000; ++i)
{
if( randInt(a,b)<a || randInt(a,b) >b)
cout << "randInt(" << a << "," << b << ") is ERROR\n";
if( randDbl(c,d)<c || randDbl(c,d) >d)
cout << "randDbl(" << c << "," << d << ") is ERROR\n";
}
return 0;
}