C#上机实验（三）

源码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            CalOprs co = new CalOprs();
            co.GetOpr("3+2");
            co.GetOpr("3*2");
            co.GetOpr("3-2");
            co.GetOpr("3/2");
        }
    }
    interface Icalt
    {
        double CalResult();
    }
    class Cal : Icalt
    {
        private double op1;
        private double op2;
        public double Op1
        {
            get {
                return op1;
            }
            set {
                op1 = value;
            }
        }
        public double Op2
        {
            get
            {
                return op2;
            }
            set
            {
                op2 = value;
            }
        }
        public Cal() {
            this.op1 = 0;
            this.op2 = 0;
        }
        public Cal(double op1, double op2)
        {
            this.op1 = op1;
            this.op2 = op2;
        }
        public virtual double CalResult()
        {
            return 0;
        }
    }
    class CalAdd : Cal {

        public CalAdd() : base()
        {

        }
        public CalAdd(double op1, double op2) :base(op1,op2)
        { 

        }
        public override double CalResult()
        {
            return this.Op1 + this.Op2;
        }
    }
    class CalSub : Cal
    {

        public CalSub()
            : base()
        {

        }
        public CalSub(double op1, double op2)
            : base(op1, op2)
        {

        }
        public override double CalResult()
        {
            return this.Op1 - this.Op2;
        }
    }
    class CalMul : Cal
    {

        public CalMul()
            : base()
        {

        }
        public CalMul(double op1, double op2)
            : base(op1, op2)
        {

        }
        public override double CalResult()
        {
            return this.Op1 * this.Op2;
        }
    }
    class CalDiv : Cal
    {

        public CalDiv()
            : base()
        {

        }
        public CalDiv(double op1, double op2)
            : base(op1, op2)
        {

        }
        public override double CalResult()
        {
            return this.Op1 / this.Op2;
        }
    }
    class CalOprs {
        public Cal GetOpr(string s) {
            int i=0;
            char op=' ';
            for (; i < s.Length; i++)
            {
                if (!(s.ElementAt(i) >= '0' && s.ElementAt(i) <= '9'))
                    op = s.ElementAt(i);
            }
            Cal ca = new Cal();
            ca.Op1 = double.Parse(s.Split(op)[0]);
            ca.Op2 = double.Parse(s.Split(op)[1]);
            switch (op) {
                case '+':
                    CalAdd caa = new CalAdd(ca.Op1, ca.Op2);
                    Console.WriteLine("{0}",caa.CalResult());
                    break;
                case '-':
                    CalSub cas = new CalSub(ca.Op1, ca.Op2);
                    Console.WriteLine("{0}", cas.CalResult());
                    break;
                case '*':
                    CalMul cam = new CalMul(ca.Op1, ca.Op2);
                    Console.WriteLine("{0}", cam.CalResult());
                    break;
                case '/':
                    CalDiv cad = new CalDiv(ca.Op1, ca.Op2);
                    Console.WriteLine("{0}", cad.CalResult());
                    break;
            }
            return ca;
        }
    }
}