简单2D游戏：2（计算器）

/**
 * 
 *  Title: 计算器开发
 *  
 *  Description:
 *      1、定义按键的用户事件响应代码
 *      2、用户点击按键但没有点击“=”的时候，显示用户输入不显示结果
 *          （1）用户连续点击按键的处理
 *          （2）用户点击操作符的处理
 *      3、用户点击等号显示结果
 *  
 *  Date: 2017.10.1
 *  
 *  Version:
 *  
 *  Modify Recoder:
 *  
 */
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class CalculateControl : MonoBehaviour
{
    private float _FirstNumber;                             //第一个操作数
    private float _SecondNumber;                            //第二个操作数
    private float _ResultNumber;                            //输入结果
    private string _Operator;                               //操作符
    private string _UserpartResult;                         //用户点击的部分结果

    public InputField _DisplayInfo;                         //显示信息的控件

    //初始化操作数
    private void Start()
    {
        _FirstNumber = 0;
        _SecondNumber = 0;
        _ResultNumber = 0;
        _ResultNumber = 0;
        _Operator = null;
        _UserpartResult = null;
    }


    #region 用户点击数值事件
    public void ClickButtonNumber_0()
    {
        ProcessNumber("0");
    }
    public void ClickButtonNumber_1()
    {
        ProcessNumber("1");
    }
    public void ClickButtonNumber_2()
    {
        ProcessNumber("2");
    }
    public void ClickButtonNumber_3()
    {
        ProcessNumber("3");
    }
    public void ClickButtonNumber_4()
    {
        ProcessNumber("4");
    }
    public void ClickButtonNumber_5()
    {
        ProcessNumber("5");
    }
    public void ClickButtonNumber_6()
    {
        ProcessNumber("6");
    }
    public void ClickButtonNumber_7()
    {
        ProcessNumber("7");
    }
    public void ClickButtonNumber_8()
    {
        ProcessNumber("8");
    }
    public void ClickButtonNumber_9()
    {
        ProcessNumber("9");
    }
    #endregion

    #region 用户点击运算符
    public void ClickButtonChar_Add()
    {
        _Operator = "+";
        _DisplayInfo.text = _Operator;
        //对前面的_UserpartResult清零，否则对后续输入有影响
        _UserpartResult = null;
    }
    public void ClickButtonChar_Sub()
    {
        _Operator = "-";
        _DisplayInfo.text = _Operator;
        _UserpartResult = null;
    }
    public void ClickButtonChar_Mult()
    {
        _Operator = "*";
        _DisplayInfo.text = _Operator;
        _UserpartResult = null;
    }
    public void ClickButtonChar_Div()
    {
        _Operator = "/";
        _DisplayInfo.text = _Operator;
        _UserpartResult = null;
    }

    /// <summary>
    /// 用户点击“=”做出运算结果并显示
    /// </summary>
    public void ClickButtonChar_Equal()
    {
        if (_Operator != null)
        {
            switch (_Operator)
            {
                case "+":
                    _ResultNumber = _FirstNumber + _SecondNumber;
                    break;
                case "-":
                    _ResultNumber = _FirstNumber - _SecondNumber;
                    break;
                case "*":
                    _ResultNumber = _FirstNumber * _SecondNumber;
                    break;
                case "/":
                    if (_SecondNumber != 0)
                    {
                        _ResultNumber = _FirstNumber / _SecondNumber;
                    }
                    break;
                default:
                    break;
            }
            _UserpartResult = _ResultNumber.ToString();
            //显示结果
            _DisplayInfo.text = _UserpartResult;
            //数值初始化
            _FirstNumber = 0;
            _SecondNumber = 0;
            _ResultNumber = 0;
            _ResultNumber = 0;
            _Operator = null;
            _UserpartResult = null;
        }
    }

    #endregion

    //用户连续点击按键的处理
    private void ProcessNumber(string UserClickNumber)
    {
        //如果连续按键。
        //则可用字符串相加的方法，再将结果转换为其他数据类型的方式
        _UserpartResult += UserClickNumber;
        _ResultNumber = float.Parse(_UserpartResult);
        //判断是为第几个操作数
        if (_Operator != null)
        {
            _SecondNumber = _ResultNumber;   //将字符串转换为float类型
        }
        else
        {
            _FirstNumber = _ResultNumber;
        }
        _DisplayInfo.text = _UserpartResult;
    }
}