我要评论.net.frameword中提供了一个专门产生随机数的类system.random，此类默认情况下已被导入，编程过程中可以直接使用。我们知道，计算机并不能产生完全随机的数字，它生成的数字被称为伪随机数，它是以相同的概率从一组有限的数字中选取的，所选的数字并不具有完全的随机性，但就实用而言，其随机程度已经足够了。
我们来看下面的例子
mainform.cs
using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.linq;
using system.text;
using system.threading.tasks;
using system.windows.forms;
//using example3.randomhelp;
namespace example3
{
public partial class mainform : form
{
timer timer = new timer();
int zheng;
int shi;
public mainform()
{
initializecomponent();
button1.click+=button1_click;
button2.click+=button2_click;
// if (textbox3.text != null)
// {
// string m = textbox3.text;
}
void timer_tick(object sender, eventargs e)
{
//throw new notimplementedexception();
// radiobutton2_click(null,null);
// double r = (example3.randomhelp.getintrandomnumber(int.parse(textbox1.text), int.parse(textbox2.text)));
// string s = r.tostring();
// label4.text = s;
if (zheng == 1)
{
int r = (example3.randomhelp.getintrandomnumber(int.parse(textbox1.text), int.parse(textbox2.text)));
string s = r.tostring();
label4.text = s;
}
if (shi == 2)
{
double r = (example3.randomhelp.getdoublerandomnumber(int.parse(textbox1.text), int.parse(textbox2.text)));
string s = r.tostring();
label4.text = s;
}
}
//整数
private void radiobutton1_checkedchanged(object sender, eventargs e)
{
radiobutton r = sender as radiobutton;
if (r.checked == true)
{
zheng = 1;
}
}
//实数
private void radiobutton2_checkedchanged(object sender, eventargs e)
{
radiobutton r = sender as radiobutton;
if (r.checked == true)
{
shi = 2;
}
}
//开始
private void button1_click(object sender, eventargs e)
{
timer.interval = int.parse(textbox3.text);
//timer.interval = 500;
timer.tick += timer_tick;
timer.start();
}
//停止
private void button2_click(object sender, eventargs e)
{
timer.stop();
}
}
}
randomhelp.cs
using system;
using system.collections.generic;
using system.linq;
using system.text;
using system.threading.tasks;
//using system.windows.forms.timer;
namespace example3
{
class randomhelp
{
public static int getintrandomnumber(int min,int max)
{
random r=new random();
int ran=r.next(min, max + 1);
return ran;
}
//很不错的算法
public static double getdoublerandomnumber(int min,int max)
{
random r = new random();
//很不错的算法
double m=r.nextdouble() * max;
double n = r.nextdouble() * min;
if(m-n>2.0)
return m;
else
return n+3.0;
}
}
}
以上所述就是本文的全部内容了，希望大家能够喜欢。
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