c#案例

输入年月日 验证

int year, mou, data;
Console.Write("请输入一个日期：年:");
string y = Console.ReadLine();
Console.Write("月:");
string m = Console.ReadLine();
Console.Write("日:");
string d = Console.ReadLine();
year = Convert.ToInt32(y);
mou = Convert.ToInt32(m);
data = Convert.ToInt32(d);
if ((year > 0000 & year < 9999) & )
{
if ((mou > 0 & mou <= 12) & (mou == 1 || mou == 3 || mou == 5 || mou == 7 || mou == 8 || mou == 10 || mou == 12))
{
if (data > 0 & data <= 31)
{
Console.WriteLine("您输入的" + year + "年" + mou + "月" + data + "日是正确日期");
}
else if ((data > 0 & data <= 30) & (mou == 4 || mou == 6 || mou == 9 || mou == 11))
{
Console.WriteLine("您输入的" + year + "年" + mou + "月" + data + "日是正确日期");
if ((data > 0 & data <= 28) & (mou == 2))
{
Console.WriteLine("您输入的" + year + "年" + mou + "月" + data + "日是正确日期");
}
else
{
Console.WriteLine("您输入的日期错误");
}
}
else
{

Console.WriteLine("您输入的日期错误");
}

 

}
else
{
Console.WriteLine("您输入的日期错误");
}
}
else if ((year > 0000 & year < 9999) & (year % 4 == 0 & year % 100 != 0) || (year % 400 == 0))
{
if (mou == 2)
{
if (data > 0 & data <= 29)
{
Console.WriteLine("您输入的" + year + "年" + mou + "月" + data + "日是正确日期");
}
else
{
Console.WriteLine("您输入的日期错误");
}

}
else
{
Console.WriteLine("您输入的日期错误");
}
}
else
{
Console.WriteLine("您输入的日期错误");
}

测缘分

Console.Write("男方姓名：");
string mr = Console.ReadLine();
Console.Write("女方姓名：");
string miss = Console.ReadLine();
Random rank = new Random();
int yuan = rank.Next(100);
if(yuan>=0&yuan<=10)
{
Console.WriteLine("缘分指数"+yuan+"，5百年只能换来回眸一笑");
}
else if (yuan > 10 & yuan <= 30)
{
Console.WriteLine("缘分指数" + yuan + "，百年修得同船渡");

}
else if (yuan > 30 & yuan <= 50)
{
Console.WriteLine("缘分指数" + yuan + "，只能做一夜夫妻");

}
else if (yuan > 50 & yuan <= 70)
{
Console.WriteLine("缘分指数" + yuan + "，7年之痒");
}
else if(yuan>70&yuan<=90)
{
Console.WriteLine("缘分指数" + yuan + "，白头偕老");
}
else if (yuan>90&yuan<=100)

{
Console.WriteLine("缘分指数" + yuan + "，人鬼情未了");
}
else
{
Console.WriteLine("缘分指数" + yuan + "，不同物种");
}

1.输入圆柱体底面积半径和高，求体积。

const double p = 3.14;
Console.WriteLine("请输入圆柱体的底面积半径:");
string r = Console.ReadLine();
Console.WriteLine("请输入圆柱体的高：");
string h = Console.ReadLine();
double R=Convert.ToDouble(r);
double H=Convert.ToDouble(h);


Console.WriteLine("圆柱体的体积是："+p*R*R*H);

2建造游泳池 泳池半径a 广场半径b 输入a和b 求泳池的护栏长度   广场砖的面积  护栏的花费  广场砖的花费

const double p=3.14;
Console.WriteLine("请输入游泳池的半径：");
string a = Console.ReadLine();
double A = Convert.ToDouble(a);

Console.WriteLine("泳池的护栏长度是："+p*A*2+"米");

Console.WriteLine("护栏的造价是："+25*p*A*2+"元");
Console.WriteLine("请输入广场半径:");
string b = Console.ReadLine();

double B = Convert.ToDouble(b);
Console.WriteLine("广场砖的面积是：" +(p*B*B-p*A*A)+ "平方米");

Console.WriteLine("广场砖花费"+85*(p*B*B-p*A*A)+"元");

3老狼几点了

Console.Write("老狼老狼几点了");
string s = Console.ReadLine();
int hour = Convert.ToInt32(s);
if (hour >= 0 && hour < 6)
{
Console .WriteLine ("凌晨"+hour+"点了");
}
else if (hour >= 6 && hour <= 12)
{ 
Console .WriteLine("上午"+hour+"点了");
}
else if (hour > 12 && hour < 18)
{ 
hour-=12;
Console .WriteLine("下午"+hour+"点了");
}
else if (hour >= 18 && hour <= 24)
{
hour -= 12;
Console.WriteLine("晚上"+hour+"点了");
}
else
{
Console.WriteLine("你家有"+hour+"点啊?");
}

4称体重。男人的标准体重是：体重（kg）=身高（cm）-100.
女人的标准体重是：体重（kg）=身高（cm）-110.
上下浮动3公斤属于正常。
要求输入 性别 身高和体重，输出正常，偏旁 偏瘦。

Console.Write("性别（男，女）:");
string sex=Console .ReadLine ();
Console.Write("体重:");
string k1 = Console.ReadLine();
double k2 = Convert.ToDouble(k1);

Console .Write("身高：");
string c=Console .ReadLine ();
double cm=Convert.ToDouble(c);
double kg=cm-100;

 

if (sex == "男")
{

if (k2 >= kg-3 && k2 <= kg+3)
{
Console.WriteLine("恭喜你，你是猛男身材！");

}

else
{
if (k2 > kg+3)
{
Console.WriteLine("狗熊，你偏重了");
}
else
{
Console .WriteLine ("猴子， 你太瘦了");
}
}
}
else if(sex=="女")
{
kg=cm-110;
if (k2 >= kg-3 && k2 <= kg+3)
{
Console.WriteLine("恭喜你，你是魔鬼身材！");

}

else
{
if (k2 > kg+3)
{
Console.WriteLine("母猪，你偏重了");
}
else
{
Console .WriteLine ("野鸡， 你太瘦了");
}
}


}
else
{
Console .WriteLine("你是外星人吗");
}

5.输入a b c 3个数 求最大

//int a, b, c, d, max;
//Console.WriteLine("请输入a,b,c,找出那个最大");
//string a1 = Console.ReadLine();
//string b1 = Console.ReadLine();
//string c1 = Console.ReadLine();
//a = Convert.ToInt32(a1);
//b = Convert.ToInt32(b1);
//c = Convert.ToInt32(c1);
//d = a > b ? a : b;
//max = d > c ? d : c;
//Console.WriteLine("最大的数是：" + max);

6 判断一元二次方程跟的情况 

int a1 ,b1,c1,d;
Console.Write("判断一元二次方程式的根的情况,输入a=");
string a = Console.ReadLine();
Console.Write("输入b=");
string b = Console.ReadLine();
Console.Write("输入c=");
string c = Console.ReadLine();

a1 = Convert.ToInt32(a);
b1 = Convert.ToInt32(b);
c1 = Convert.ToInt32(c);

d=b1*b1-4*a1*c1;
if(a1==0)
{
Console.WriteLine("这不是一元二次方程");
}
else if(d>0) 
{
Console.WriteLine("有2个不同实跟");
}
else if (d == 0)
{
Console.WriteLine("有2个相同的实根");
}
else 
{
Console.WriteLine("没有实根");
}

7 闰年 平年判断

Console.Write("请输入一个年份（0000-9999）：");
string y = Console.ReadLine();
int year = Convert.ToInt32(y);

if (((year % 4 == 0 & year % 100 != 0) || (year % 400 == 0)) & (year > 0000 & year < 9999))
{
Console.WriteLine(year+"年是闰年");
}
else if ((year % 4 != 0 || (year % 400 != 0)) & (year > 0000 & year < 9999))
{
Console.WriteLine(year+"年是平年");
}
else
{
Console .WriteLine ("您输入的年份错误");
}