using System;
public class ChengFaBiao
{

public static void Main()
{

Console.WriteLine("jiu jiu cheng fa biao");
for (int x = 1; x <= 9; x++) ;
{
for (int y = 1; y <= x; y++) ;
{
Console.Write("{0}*{1}={2}\t",x,y,x * y);
}
Console.WriteLine();

}

}
}

using System;
public class ChengFaBiao
{
public static void Main()
{
Console.WriteLine ("jiu jiu cheng fa biao");
for(int x=1;x<=9;x++)
{
for(int y=1;y<=x;y++)
{
Console.Write ("{0}*{1}={2}\t",x,y,x*y);
}
Console.WriteLine ();
}
}
}

上面的是我抄的
下面是对的程序

我抄的那个老提示当前上下文不存在x ,y

错误提示
类,结构或接口信息中的标记无效

fuck
using System;
class Test
{
static void Swap(ref int x,ref int y)
{
int temp = x;
x = y;
y = temp;
}
static void Main()
{
int i = 1;
int j = 2;
Swap(ref i,ref j);
Console.WriteLine("i={0},j={1}",i,j);
Console.ReadLine();
}

}

using System;
class Test
{
static void Swap(ref int x,ref int y)
{
int temp = x;
x = y;
y = temp;
}
static void Main()
{
int i = 1;
int j = 2;
Swap(ref i,ref j);
Console.WriteLine("i={0},j={1}",i,j);
Console.ReadLine();
}

}