C#类
namespace Ti2
{
class ZhengXing
{
private int a;
public ZhengXing(int x)
{
a = x;
}
public bool ZhiShu()
{
bool flag=true;
for (int i=2;i<a;i++)
if(a%i==0)
{
flag =false ;
break;
}
return flag;
}
public int ChiFang(int N)
{
int x=1;
if(N ==0)
x=1;
else
for(int i=0;i <N;i++)
x=x*a;
return x;
}
public void ZhuanHuan()
{
int count = 0;
int[] b;
for (int i = 0; a != 0; i++)
{
b[i] = a % 2;
a = a / 2;
count = count + 1;
}
for (int i = count - 1; i >= 0; i--)
Console.Write(b[i]);
}
}
class Program
{
static void Main(string[] args)
{
ZhengXing ZX = new ZhengXing(10);
bool flag = ZX.ZhiShu();
if (flag == true)
Console.WriteLine("这个数是质数");
else
Console.WriteLine("这不是一个质数");
int x = ZX.ChiFang(2);
Console.WriteLine("这个数的N次方是{0}",x);
ZX.ZhuanHuan();
Console.ReadLine();
}

}
}

错误1使用了未赋值的局部变量“b”
(这个错是什么意思啊，求解释啊，先解答就得全分哦，我是新手《《《，谢谢)


[解决办法]
public void ZhuanHuan()
{
int count = 0;
List<int> b = new List<int>();
for (int i = 0; a != 0; i++)
{
b.Add(a % 2);
a = a / 2;
count = count + 1;
}
for (int i = count - 1; i >= 0; i--)
Console.Write(b[i]);
}

[解决办法]
int[] b; //b只是定义了，没有初始化
[解决办法]
你就是没给数组int[] b初始化，一般的做法是下面这样（也许C语言时候是这样的）

C# code

 public void ZhuanHuan()            {                int count = 0;                int[] b = new int[100];                for (int i = 0; a != 0; i++)                {                    b[i] = a % 2;                    a = a / 2;                    count = count + 1;                }                for (int i = count - 1; i >= 0; i--)                    Console.Write(b[i]);            }