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//¶þ¸öÊäÈëÖ»ÄÜÊäÈëÕûÊý£¬²»È»³ö´í
Console.WriteLine("ÊäÈëA£º");
string a = Console.ReadLine();
int A = int.Parse(a);
Console.WriteLine("ÊäÈëB£º");
string b = Console.ReadLine();
int B = int.Parse(b);
Console.WriteLine(A+B);
Console.ReadLine();//Õâ¾äÈóÌÐòÔÝÍ£


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int Add(int a,int b){
  checked{
    return a+b;
  }
}



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int A = int.Parse(a);

int B = int.Parse(b);

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  ÓÃ int.TryParse(string s);

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C# code:

int? a = null


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