using System; //引用System命名空间 命名空间里面会有很多类名和方法
namespace ConsoleApp1 //遵循大驼峰命名 每个单词首个字母大写 { //创建一个类名 ctrl+k ctrl+c组合快捷键实现单行注释切换 //取消单行注释 ctrl+k+u
class Programs
{
//主函数，程序入口
static void Main(String[] args)
{
//编写第一个helloworld 换行 crtr + shift + enter
Console.WriteLine("Hello World");//WriteLine会输出换行符
Console.Write("不换行");
/*Console.Write("不换行");
Console.Write("不换行");
Console.Write("不换行");
Console.Write("不换行");
Console.Write("不换行");*/
//取消转义的两种方式
Console.WriteLine(@"\n\t");
Console.WriteLine("\\n\\t");
int a = 10, b = 12;
a = a++ + b--;
//上移 下移 alt+^
//ctrl+delete删除光标后面的代码
//ctrl+退格 删除光标前面的代码
}
}
}
c#数据类型值范围
`
using System; namespace ConsoleApp2;
class Program {
static void Main(String[] args)
{
/* int Cj = Convert.ToInt32(Console.ReadLine());
if (Cj >= 90 && Cj <= 100)
{
Console.WriteLine("A");
}
else if (Cj >= 70 && Cj <= 89)
{
Console.WriteLine("B");
}
else if (Cj >= 60 && Cj <= 69)
{
Console.WriteLine("C");
}
else if (Cj < 60)
{
Console.WriteLine("D");
}*/
/* Console.WriteLine("请输入x");
int x = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("请输入y");
int y = Convert.ToInt32(Console.ReadLine());
if (x > 0 && y > 0)
{
Console.WriteLine("第一象限");
}
else if(x > 0 && y < 0)
{
Console.WriteLine("第二象限");
}
else if (x < 0 && y > 0)
{
Console.WriteLine("第三象限");
}
else
{
Console.WriteLine("第四象限");
}*/
/*int n = 0;
int a = Convert.ToInt32(Console.ReadLine());
int max = a;
int min = a;
while (n < 3)
{
a = Convert.ToInt32(Console.ReadLine());
if (a > max)
{
max = a;
}
if (a < min)
{
min = a;
}
n++;
}
Console.WriteLine(max);
Console.WriteLine(min);*/
/*int n = Convert.ToInt32(Console.ReadLine());
int sum = 0;
while (n > 0)
{
sum += n;
n--;
}
Console.WriteLine(sum);*/
/*int n = Convert.ToInt32(Console.ReadLine());
int count = 0;
while (n != 1)
{
count++;
if(n % 2 == 1)
{
n = 3 * n + 1;
Console.WriteLine(n);
}
else
{
n /= 2;
Console.WriteLine(n);
}
}
Console.WriteLine(count);*/
/*int num = Convert.ToInt32(Console.ReadLine());
int age = 0;
double count = 0.0;
while(num > 0)
{
age += Convert.ToInt32(Console.ReadLine());
count++;
num--;
}
double a_age = age / count;
Console.WriteLine(a_age.ToString("0.00"));*/
/*int n = Convert.ToInt32(Console.ReadLine());
int m = Convert.ToInt32(Console.ReadLine());
int sum = 0;
for (; n <= m; n++)
{
if(n % 17 == 0)
{
Console.WriteLine(n);
sum += n;
}
}
Console.WriteLine(sum);*/
/*int a = Convert.ToInt32(Console.ReadLine());
int target = a;
int n = Convert.ToInt32(Console.ReadLine());
for(int i = 1; i < n; i++)
{
target = target * a;
}
Console.WriteLine(target);*/
/*int num = 10;
double hight = 10.00;
double count = 0;
while (num > 0)
{
count += hight;
if (num == 1)
{
break;
}
hight /= 2;
Console.WriteLine(hight);
count += hight;
num--;
}
Console.WriteLine(count);*/
/*int n = 100;
for(int i = 0; i < n; i++)
{
for(int j = 0; j <= i; j++)
{
Console.Write("*");
}
Console.WriteLine();
}
for (int i = n-1; i > 0; i--)
{
for (int j = 0; j <= i-1; j++)
{
Console.Write("*");
}
Console.WriteLine();
}*/
/*int n = 50;
for(int i = 1; i <= n; i++)
{
for(int j = 0; j < n-i; j++)
{
Console.Write(" ");
}
for(int j = 0; j < 2*i-1; j++)
{
Console.Write("*");
}
Console.WriteLine();
}
for (int i = n-1; i >= 1; i--)
{
for (int j = 0; j < n-i; j++)
{
Console.Write(" ");
}
for (int j = 2 * i - 1; j > 0; j--)
{
Console.Write("*");
}
Console.WriteLine();
}*/
/*for (int i = 1; i <= 9; i++)
{
for (int j = 1; j <= i; j++)
{
Console.Write(j + "*" + i + "=" + i * j + "\t");
}
Console.WriteLine();
}
for (int i = 8;i >= 1; i--)
{
for(int j = 1;j <= i; j++)
{
Console.Write(j + "*" + i + "=" + i * j+"\t");
}
Console.WriteLine();
}*/
/*int count = 0;
for(int x = 1; x <= 100/3; x++)
{
for(int y = 1; y <= 100/5; y++)
{
for(int z = 1; z <= 100/2; z++)
{
if(3*x + 5*y+2*z == 100)
{
count++;
Console.WriteLine("x={0},\ty={1},\tz={2}",x,y,z);
}
}
}
}
Console.WriteLine(count);*/
/*int num1 = 12;
int num2 = 36;
int target = 0;
for(int i = num1; i > 0; i--)
{
if(num2 % i == 0 && num1 % i == 0)
{
target = i;
break;
}
}
Console.WriteLine(target);*/
Random random = new Random();
int num = random.Next(1,100);
Console.WriteLine(num);
}
}
