using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ConsoleApplication1 { public class Program { public class Operate { protected int a, b; public Operate(int a, int b) { this.a = a; this.b = b; } public virtual int op() { return -1; } } /// <summary> /// 整数相加 /// </summary> public class Sum : Operate { public Sum(int a, int b) : base(a, b) { } public override int op() { return this.a + this.b; } } /// <summary> /// 整数相减 /// </summary> public class Sub : Operate { public Sub(int a, int b) : base(a, b) { } public override int op() { return this.a - this.b; } } /// <summary> /// 整数相乘 /// </summary> public class Muli : Operate { public Muli(int a, int b) : base(a, b) { } public override int op() { return this.a * this.b; } } public class Programdgd { static void Main(string[] args) { Console.WriteLine("请录入两个整数:"); int num1 = int.Parse(Console.ReadLine()); int num2 = int.Parse(Console.ReadLine()); Operate sum = new Sum(num1, num2); int result1 = sum.op(); Console.WriteLine("相加的结果:{0}", result1); Operate sub = new Sub(num1, num2); int result2 = sub.op(); Console.WriteLine("相减的结果:{0}", result2); Operate muli = new Muli(num1, num2); int result3 = muli.op(); Console.WriteLine("相乘的结果:{0}", result3); Console.ReadLine(); } } } }