摘要：
接口namespace Calculator{ public interface Iwel { String Print(); }}类namespace Calculator{ public class Arithmetic:Iwel { /// <summary> /// 没有带参数的构造函数 /// </summary> public Arithmetic() {} public Arithmetic(int num1, int num2) { _num1 = num1; _num2 = num2; } private int _num1; public int N 阅读全文
