段点：用于调试；
选择语句：if else switch case;
循环语句：do for foreach while;
跳转语句：break continue default return;
异常语句：try-catch-finally;
for (int i = 1/*初始值*/; i <= 20/*循环条件（条件表达）*/; i++/*状态改变*/)
（for循环可直接按Tob键）
换行 ; =Console.ReadLine;
Console.Write("请输入年份");
int a = int.Parse(Console.ReadLine());
if (a % 400 == 0 || (a % 100 != 0 && a % 4 == 0))
{
Console.Write("这是闰年");
}
else
{
Console.Write("不是闰年");*/
//输入姓名、成绩输出级别、80-100优秀，60-79一般，0-59继续努力//
//输入年月日，输出这一天是这年的第多少天. 输入一元二次方程的三个参数，判断方程有无实根//
/* Console.WriteLine("请输入姓名");
string a=Console.ReadLine();
Console.WriteLine("请输入成绩");
int b = int.Parse(Console.ReadLine());
if((b<=100)&&(b>=80))
{
Console.WriteLine(a + "优秀");
}
else if((b>=60&&b<=79))
{
Console.WriteLine(a+"一般");
}
else
{
Console.WriteLine (a+"继续努力");
}
Console.ReadLine ();*/
/* Console.WriteLine("请输入年份");
int y = int.Parse(Console.ReadLine());
Console.WriteLine("请输入月份");
int m = int.Parse(Console.ReadLine());
Console.WriteLine("请输入天数");
int d = int.Parse(Console.ReadLine());
if (!(y >= 1759 && y <= 9999))
{
Console.WriteLine("输入的年份不正确!y应该在1759-9999之间");
}
else
{
if (!(m >= 1 && m <= 12))
{
Console.WriteLine("输入的月份不正确！m应该在1-12之间");
}
else
{
if ((m == 1 || m == 3 || m == 5 || m == 7 || m == 8 || m == 10 || m == 12) && (!(d >= 1 && d <= 31)))
{
Console.WriteLine("1,3,5,7,8,10,12月要在1-31的范围内");
}
else if ((m == 4 || m == 6 || m == 9 || m == 11) && (!(d <= 1 && d >= 30)))
{
Console.WriteLine("4,6,9,11月要在1-30的范围内");
}
else
{
if (m == 2 && (y % 400 == 0 || (y % 100 != 0 && y % 4 == 0)) && (!(d >= 1 && d <= 29)))
{
Console.WriteLine("闰年二月1-29");
}
else if (m == 2 && (y % 400 == 0 || (y % 100 != 0 && y % 4 == 0)) && (!(d >= 1 && d <= 28)))
{
Console.WriteLine("平年二月1-28");
}
else
{
Console.WriteLine("日期正确");
int sumday = 0;
if (y % 400 == 0 || (y % 100 != 0 && y % 4 == 0))
{
if (m == 1)
sumday += d;
if (m == 2)
sumday += 31 + d;
if (m == 3)
sumday += 31 + 29 + d;
if (m == 4)
sumday += 31 + 29 + 30 + d;
if (m == 5)
sumday += 31 + 29 + 31 + 30 + d;
if (m == 6)
sumday += 31 + 29 + 31 + 30 + 31 + d;
if (m == 7)
sumday += 31 + 29 + 31 + 30 + 31 + 30 + d;
if (m == 8)
sumday += 31 + 29 + 31 + 30 + 31 + 30 + 31 + d;
if (m == 9)
sumday += 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + d;
if (m == 10)
sumday += 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + d;
if (m == 11)
sumday += 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + d;
if (m == 12)
sumday += 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + d;
}
else
{
if (m == 1)
sumday += d;
if (m == 2)
sumday += 31 + d;
if (m == 3)
sumday += 31 + 28 + d;
if (m == 4)
sumday += 31 + 28 + 30 + d;
if (m == 5)
sumday += 31 + 28 + 31 + 30 + d;
if (m == 6)
sumday += 31 + 28 + 31 + 30 + 31 + d;
if (m == 7)
sumday += 31 + 28 + 31 + 30 + 31 + 30 + d;
if (m == 8)
sumday += 31 + 28 + 31 + 30 + 31 + 30 + 31 + d;
if (m == 9)
sumday += 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + d;
if (m == 10)
sumday += 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + d;
if (m == 11)
sumday += 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + d;
if (m == 12)
sumday += 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + d;
}
Console.WriteLine("这天是这一年的第{0}天", sumday);
}
}
}
Console.ReadLine();*/
Random r=new Random();
int shu=r.Next(3);//int shu=r.Next(3);
Console.WriteLine("0-包袱，1-剪刀，2-石头");
if(shu==0)
{
Console.WriteLine("电脑出包袱");
}
else if(shu==1)
{
Console.WriteLine("电脑出剪刀");
}
else
{
Console.WriteLine("电脑出石头");
}
Console.ReadLine();
/*int renwin = 0;
int cmpwin = 0;
int ren = -1;
int cmp = -1;
//输入
ren = Convert.ToInt32(Console.ReadLine());
Random rand = new Random();
cmp = rand.Next(3);
//判断输出
if (ren == 0) //0-布，1-剪刀，2-石头
{
if (cmp == 0)
{
Console.WriteLine("平局");
}
else if (cmp == 1)
{
Console.WriteLine("Computer Win!");
cmpwin++;
}
else
{
Console.WriteLine("Human Win!");
renwin++;
}
}
else if (ren == 1)
{
if (cmp == 0)
{
Console.WriteLine("Computer Win!");
cmpwin++;
}
else if (cmp == 1)
{
Console.WriteLine("平局");
}
else
{
Console.WriteLine("Human Win!");
renwin++;
}
}
else if (ren == 2)
{
if (cmp == 0)
{
Console.WriteLine("Computer Win!");
cmpwin++;
}
else if (cmp == 1)
{
Console.WriteLine("Human Win!");
renwin++;
}
else
{
Console.WriteLine("平局");
}
}
else
{
Console.WriteLine("请按套路出拳");
}
//输入
ren = Convert.ToInt32(Console.ReadLine());
cmp = rand.Next(3);
if (ren == 0) //0-布，1-剪刀，2-石头
{
if (cmp == 0)
{
Console.WriteLine("平局");
}
else if (cmp == 1)
{
Console.WriteLine("Computer Win!");
cmpwin++;
}
else
{
Console.WriteLine("Human Win!");
renwin++;
}
}
else if (ren == 1)
{
if (cmp == 0)
{
Console.WriteLine("Computer Win!");
cmpwin++;
}
else if (cmp == 1)
{
Console.WriteLine("平局");
}
else
{
Console.WriteLine("Human Win!");
renwin++;
}
}
else if (ren == 2)
{
if (cmp == 0)
{
Console.WriteLine("Computer Win!");
cmpwin++;
}
else if (cmp == 1)
{
Console.WriteLine("Human Win!");
renwin++;
}
else
{
Console.WriteLine("平局");
}
}
else
{
Console.WriteLine("请按套路出拳");
}
ren = Convert.ToInt32(Console.ReadLine());
cmp = rand.Next(3);
if (ren == 0) //0-布，1-剪刀，2-石头
{
if (cmp == 0)
{
Console.WriteLine("平局");
}
else if (cmp == 1)
{
Console.WriteLine("Computer Win!");
cmpwin++;
}
else
{
Console.WriteLine("Human Win!");
renwin++;
}
}
else if (ren == 1)
{
if (cmp == 0)
{
Console.WriteLine("Computer Win!");
cmpwin++;
}
else if (cmp == 1)
{
Console.WriteLine("平局");
}
else
{
Console.WriteLine("Human Win!");
renwin++;
}
}
else if (ren == 2)
{
if (cmp == 0)
{
Console.WriteLine("Computer Win!");
cmpwin++;
}
else if (cmp == 1)
{
Console.WriteLine("Human Win!");
renwin++;
}
else
{
Console.WriteLine("平局");
}
}
else
{
Console.WriteLine("请按套路出拳");
}
//.......
if (renwin > cmpwin)
{
Console.WriteLine("Ren YingLe");
}
else if (renwin == cmpwin)
{
Console.WriteLine("Ping Ju");
}
else
{
Console.WriteLine("Computer YingLe");
}
Console.ReadLine();
}
}
}
Console.ReadLine();*/
/* int renwin = 0;
int dnwin = 0;
for (;; )
{
Random r = new Random();
int dn = r.Next(3);
Console.Write("请出拳：0-包袱，1-剪刀，2-石头");
int ren = int.Parse(Console.ReadLine());
if(dn-ren==-1||dn-ren==2)
{
Console.Write("电脑输了，人赢了");
}
else if(dn==ren)
{
Console.Write("平局");
}
else
{
Console.Write("你输了，电脑赢了");
dnwin++;
}
}
if (dnwin==2||renwin==2)
{
break;
}
else if (dnwin==2)
{
Console.Write("你输了");
}
else
{
Console.Write("你赢了");
}
Console.ReadLine();*/
/* Console.WriteLine("请输入变量a的值");
int a = int.Parse(Console.ReadLine());
Console.WriteLine("请输入变量b的值");
int b = int.Parse(Console.ReadLine());
Console.WriteLine("请输入变量c的值");
int c = int.Parse(Console.ReadLine());
if (a == 0)
{
Console.WriteLine("不是一元二次方程");
}
else
{
if (a != 0 && b * b - 4 * a * c > 0)
{
Console.WriteLine("一元二次方程有两个不相等的实数根");
}
else if (a != 0 && b * b - 4 * a * c == 0)
{
Console.WriteLine("一元二次方程有一个实数根");
}
else
{
Console.WriteLine("一元二次方程无实数根");
}
}
Console.ReadLine();*/
}
}
}
}
for循环
Console.WriteLine ("请输入一个数");
int n=int.Parse (Console.ReadLine());
int b=0
for (int i = 1; i <= n; i++)
{
if(n%i==0)
{
b++;
}
}
if(b==2);
{
Console.WriteLine("这个数是质数");
}
else
{
Console.WriteLine("这个数不是质数");
}
Console.ReadLine();
/* Console.WriteLine("请输入一个数");
int n = int.Parse("Console.ReadLine");*/
/* Console.WriteLine("请输入一个数");
int m = int.Parse("Console.ReadLine");
int sum = 1;
for (int n= 0; n <=m; n ++)
{
int s = 1;
for (int i = 0; i <= n; i++)
{
s = s * i;
}
sum += s;
}
Console.WriteLine("阶乘的和为{0}", sum);
Console.ReadLine();*/
穷举
/* int count = 0;
for (int i = 1; i <= 20; i++)
{
for (int r = 1; r <= 50; r++)
{
for (int e = 1; e <= 33; e++)
{
if (i*5 + r*2 + e*3 == 100)
{
Console.WriteLine("100元正好买{0}种牙膏,{1}种牙刷,{2}种肥皂", i, r, e);
count++;
}
}
}
}
Console.WriteLine("共有{0}种可能",count);*/
/* int count=0;
for (int p = 1; p <=13; p++)
{
for (int q = 1; q <=66 ; q++)
{
for (int s = 1; s <=100 ; s++)
{
if(p*15+q*3+s*2==200)
{
Console.WriteLine("200元可以买{0}种羽毛球拍，{1}种球，{2}种水",p,q,s);
count++;
}
}
}
}
Console.WriteLine("共有{0}种可能",count);
Console.ReadLine();*/
/* int ct = 0;
int xt=0;
int yt = 1;
int sum=0;
for (int i =2;i <=24; i++)
{
ct=xt+ct;
xt=yt;
yt=ct;
sum=ct+xt+yt ;
Console.WriteLine("第{0}个月的成兔{1}小兔{2}幼兔{3}总数{4}",i,ct,xt,yt,sum);
}
Console.ReadLine();*/
}
}
}