作业要求

定义两个变量：number1 ,number2并赋值，并使两个变量赋值交换（注：不得添加临时变量）

代码

        int number1 = 10;
        int number2 = 5;
        Console.WriteLine("number1={0},number2={1}", number1, number2);
        number1 = number1 + number2;//number1 = 15
        number2 = number1 - number2;//number2 = 10
        number1 = number1 - number2;//number1 = 5 
        Console.WriteLine("↓替换后");
        Console.WriteLine("number1={0},number2={1}", number1, number2);
        Console.ReadKey();             

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输出结果

今天加了注释