IF 10位数时 OK...等等

Question

大家好，我是.NET 新手。请大家多多帮忙。
现在有个问题。IF  A 等于 10位数  
并且  前面2位是  65 开头的    Z = B   
 
如果不是10位数   Z= C 。
如果是 10位数，但 前面开头不是 65, Z = C 
这种代码怎么写呢？
谢谢大家！

Answer 1

 int A=10;
string Str=A.ToString();
if(Str.Length==10 && Str.Substring(0,2)=="65")
Z=B;
else
Z=C;

Answer 2

string A = "65345678900";
        string Z = "", B = "", C = "";
        try
        {
            if (a.Length == 10)
            {
                if (a[0].ToString() == "6" && a[1].ToString() == "5")
                {
                    Z = B;
                }
                else
                {
                    Z = C;
                }
            }
            else
            {
                Z = C;
            }
        }
        catch (Exception EX)
        {
           //todo:
        }

Answer 3

Z = (A.Length==10 && A.SubString(0,2) == "65") ? B : C

Answer 4

 int a = 1234567890;
        int z = 0;
        int b = 1;
        int c = 2;        if (Convert.ToString(a).Length == 10)
        {
            if (Convert.ToString(a).Substring(0, 2) == "65")
            {
                z = b;
            }
            else
            {
                z = c;
            }           
        }
        else
        {
            z = c;
        }

Answer 5

你把A转化成字符串string astr = A.ToString();

Answer 6

string tmp = a.toString();
if(tmp.length = 10 && tmp.subString(0,2).equels("65"))
{
   Z = B;   
}else {z = c;}

Answer 7

if (a/1000000000>0)
   ...

Answer 8

if ((A/1000000000==6)&&(A/100000000==5))
   ....

Answer 9

上面的不对
if ((A/1000000000==6) && （(A/100000000-60）==5))
   ....

Answer 10

int A;
if ((A/1000000000==6) && （(A/100000000-60）==5)){Z=B;}else{Z=C;}

Answer 11

            if (A >= 6500000000 && A <= 6600000000)
                Z = B;
            else 
                Z = C;

Answer 12

            if (A >= 6500000000 && A < 6600000000)
                Z = B;
            else 
                Z = C;