//判断是否是闰年
int b = int.Parse(Console.ReadLine());
if (b % 4 == 0 && b % 100 != 0)
{
Console.WriteLine("是闰年");
}
else if (b % 400 == 0)
{
Console.WriteLine("是闰年");
}
else
Console.WriteLine("不是闰年");
Console.ReadLine();
//控制台分别录入年月日，判断是否是一个正确的日期
Console.WriteLine("请输入年");
string year = Console.ReadLine();
int x = int.Parse(year);
Console.WriteLine("请输入月");
string month = Console.ReadLine();
int y = int.Parse(month);
Console.WriteLine("请输入日");
string day = Console.ReadLine();
int z = int.Parse(day);
if ((y == 1) || (y == 3) || (y == 5) || (y == 7) || (y == 8) || (y == 10) || (y == 12))
{
if ((z >= 1) && (z <= 31))
{
Console.WriteLine("输入正确");
}
else
Console.WriteLine("请输入正确的日");
}
else if (y == 2)
{
if ((x % 4 == 0 && x % 100 != 0) || (x % 400 == 0))
{
if ((z >= 1) && (z <= 29))
{
Console.WriteLine("输入正确");
}
Console.WriteLine("请输入正确的日");
}
else if (x % 4 != 0)
{
if ((z >= 1) && (z <= 28))
{
Console.WriteLine("输入正确");
}
Console.WriteLine("请输入正确的日");
}
}
else if((y==4)||(y==6)||(y==9)||(y==11))
{
if ((z >= 1) && (z <= 30))
{
Console.WriteLine("输入正确");
}
else
Console.WriteLine("请输入正确的日");
}
else
Console.WriteLine("请输入正确的月");
Console.ReadLine();
//输入一个1-100之内的数，判断是否跟7有关
int a = int.Parse(Console.ReadLine());
if(a>=1 && a<=100)
{
if((a%7==0)||(a%10==7)||(a/10==7))
{
Console.WriteLine("与7有关");
}
else
Console.WriteLine("与7无关");
//输入身高、体重、性别，判断是否是标准体重，男性标准=(身高-100)+-3,女性标准=(身高-110)+-3
Console.WriteLine("请输入身高");
int hight = int.Parse(Console.ReadLine());
Console.WriteLine("请输入体重");
int weight = int.Parse(Console.ReadLine());
Console.WriteLine("请输入性别");
string sex = Console.ReadLine();
if (sex == "男")
{
int a = hight - 100;
if (weight > (a + 3))
{
Console.WriteLine("不是标准体重，偏胖");
}
else if (weight <= (a + 3) && weight >= (a - 3))
{
Console.WriteLine("是标准体重");
}
else
Console.WriteLine("不是标准体重，偏瘦");
Console.ReadLine();
}
else if (sex == "女")
{
int a = hight - 110;
if (weight > (a + 3))
{
Console.WriteLine("不是标准体重，偏胖");
}
else if (weight <= (a + 3) && weight >= (a - 3))
{
Console.WriteLine("是标准体重");
}
else
Console.WriteLine("不是标准体重，偏瘦");
}
else
Console.WriteLine("请输入正确的性别");
Console.ReadLine();
//输入一元二次方程的三个参数，a，b，c，判断是否为一元二次方程，并求解
Console.WriteLine("请输入a");
int a = int.Parse(Console.ReadLine());
Console.WriteLine("请输入b");
int b = int.Parse(Console.ReadLine());
Console.WriteLine("请输入c");
int c = int.Parse(Console.ReadLine());
int r = (b * b - 4 * a * c);
if (r > 0)
{
double x1 = (Math.Sqrt(r) - b) / (2 * a);
double x2 = (-b - Math.Sqrt(r)) / (2 * a);
Console.WriteLine("方程有两个不相等的解：x1={0},x2={1}",x1,x2);
}
else if (r == 0)
{
double x = (-b) / (2 * a);
Console.WriteLine("方程有一个解");
Console.WriteLine(x);
}
else
{
Console.WriteLine("方程没有实数解");
}
Console.ReadLine();
//与电脑猜拳
Console.WriteLine("猜拳：请输入剪刀-0、石头-1或布-2");
int human=int.Parse(Console.ReadLine());
Random r = new Random();
int computer = r.Next(3);
if((human-computer==1)||(computer-human==2))
{
Console.WriteLine("电脑出拳={0},你出拳={1}+你赢了",computer,human);
}
else if((computer-human==2)||(human-computer==1))
{
Console.WriteLine("电脑出拳={0},你出拳={1}+你输了",computer,human);
}
else
Console.WriteLine("平局");
Console.WriteLine();
Console.WriteLine();
//switch case
int i=int.Parse(Console.ReadLine());
switch(i)
{
case 1:
console.WriteLine("星期一");
break;
case 2:
console.WriteLine("星期二");
break;
case 3:
console.WriteLine("星期三");
break;
case 4:
console.WriteLine("星期四");
break;
case 5:
console.WriteLine("星期五");
break;
default:
console.WriteLine("你输入的可能不正确");
break;
//计算一年的第几天
Console.WriteLine("请输入年");
int year = int.Parse(Console.ReadLine());
Console.WriteLine("请输入月");
int month = int.Parse(Console.ReadLine());
Console.WriteLine("请输入日");
int day = int.Parse(Console.ReadLine());
int sum=0;
if ((year % 4 == 0 && year % 100 != 0)||(year%400==0))
switch(month)
{
case 1:
sum=day;
break;
case 2:
sum=31+day;
break;
case 3:
sum=31+29+day;
break;
case 4:
sum=31+29+31+day;
break;
case 5:
sum=31+29+31+30+day;
break;
case 6:
sum=31+29+31+30+31+day;
break;
case 7:
sum=31+29+31+30+31+30+day;
break;
………………
default;
Console.ReadLine();
break;