prefix-postfix_Application

[NIIT]

میاد در مورد postfixها و prefixها در محیط application نمونه کدهایی در اختیارتون میذاره:

کلاس CStack :

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

namespace charachter
{
    class ClassStack
    {
        int Size = 100;
        object[] Item;
        int MyTop;
        public ClassStack()
        {
            MyTop = -1;
            Item = new object[Size];
        }
        public bool IsFull()
        {
            if (MyTop == Size - 1)
                return true;
            else
                return false;
        }
        public bool IsEmpty()
        {
            if (MyTop == -1)
                return true;
            else
                return false;
        }
        public bool Push(object n)
        {
            if (IsFull())
                return false;
            else
            {
                Item[++MyTop] = n;
                return true;
            }
        }
        public object Pop()
        {
            if (IsEmpty())
                return -1;
            else
                return Item[MyTop--];
        }
        public object Test_Top()
        {
            if (IsEmpty())
                return -1;
            else
                return Item[MyTop];
        }
    }
}

فراخونی در فرم رو نمایش میده:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace charachter
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btn_ShowPostfix_Click(object sender, EventArgs e)
        {
            ClassStack SampleStack1 = new ClassStack();
            object MyTop1 = null;
            object MyTop_PP1 = null;
            string str1 = txt_EnterString.Text;
            string CapacityPostfix1 = "";
            bool Num1 = true;
            for (int i = 0; i < str1.Length; i++)
            {
                switch (str1[i])
                {
                    case '+':
                        while (Num1)
                        {
                            MyTop1 = SampleStack1.Test_Top();
                            if (SampleStack1.IsEmpty())
                            {
                                SampleStack1.Push(str1[i]);
                                break;
                            }
                            else if ((char)MyTop1 == '/')
                            {
                                MyTop_PP1 = SampleStack1.Pop();
                                CapacityPostfix1 += MyTop_PP1;
                            }
                            else if ((char)MyTop1 == '*')
                            {
                                MyTop_PP1 = SampleStack1.Pop();
                                CapacityPostfix1 += MyTop_PP1;
                            }
                            else if ((char)MyTop1 == '+')
                            {
                                MyTop_PP1 = SampleStack1.Pop();
                                CapacityPostfix1 += MyTop_PP1;
                            }
                            else if ((char)MyTop1 == '-')
                            {
                                MyTop_PP1 = SampleStack1.Pop();
                                CapacityPostfix1 += MyTop_PP1;
                            }
                        }
                        break;
                        
                
                case '-':
                        while (Num1)
                        {
                            MyTop1 = SampleStack1.Test_Top();
                            if (SampleStack1.IsEmpty())
                            {
                                SampleStack1.Push(str1[i]);
                                break;
                            }
                            else if ((char)MyTop1 == '+')
                            {
                                MyTop_PP1 = SampleStack1.Pop();
                                CapacityPostfix1 += MyTop_PP1;
                            }
                            else if ((char)MyTop1 == '-')
                            {
                                MyTop_PP1 = SampleStack1.Pop();
                                CapacityPostfix1 += MyTop_PP1;
                            }
                            else if ((char)MyTop1 == '/')
                            {
                                MyTop_PP1 = SampleStack1.Pop();
                                CapacityPostfix1 += MyTop_PP1;
                            }
                            else if ((char)MyTop1 == '*')
                            {
                                MyTop_PP1 = SampleStack1.Pop();
                                CapacityPostfix1 += MyTop_PP1;
                            }
                        }
                        break;

                case '/':
                        while (Num1)
                        {
                            MyTop1 = SampleStack1.Test_Top();
                            if (SampleStack1.IsEmpty())
                            {
                                SampleStack1.Push(str1[i]);
                                break;
                            }
                            else if ((char)MyTop1 == '*')
                            {
                                MyTop_PP1 = SampleStack1.Pop();
                                CapacityPostfix1 += MyTop_PP1;
                            }
                            else if ((char)MyTop1 == '/')
                            {
                                MyTop_PP1 = SampleStack1.Pop();
                                CapacityPostfix1 += MyTop_PP1;
                            }
                            else if ((char)MyTop1 == '-')
                            {
                                SampleStack1.Push(str1[i]);
                                break;
                            }
                            else if ((char)MyTop1 == '+')
                            {
                                SampleStack1.Push(str1[i]);
                                break;
                            }
                        }
                        break;

                case '*':
                        while (Num1)
                        {
                            MyTop1 = SampleStack1.Test_Top();
                            if (SampleStack1.IsEmpty())
                            {
                                SampleStack1.Push(str1[i]);
                                break;
                            }
                            else if ((char)MyTop1 == '-')
                            {
                                MyTop_PP1 = SampleStack1.Pop();
                                CapacityPostfix1 += MyTop_PP1;
                            }
                            else if ((char)MyTop1 == '/')
                            {
                                MyTop_PP1 = SampleStack1.Pop();
                                CapacityPostfix1 += MyTop_PP1;
                            }
                            else if ((char)MyTop1 == '*')
                            {
                                SampleStack1.Push(str1[i]);
                                break;
                            }
                            else if ((char)MyTop1 == '+')
                            {
                                SampleStack1.Push(str1[i]);
                                break;
                            }
                        }
                        break;
                default:
                        CapacityPostfix1 += str1[i];
                        break;
                }
            }
            while (Num1)
            {
                if (SampleStack1.IsEmpty())
                    break;
                else
                    CapacityPostfix1 += SampleStack1.Pop();
            }
            txt_ShowResultPostfix.Text = CapacityPostfix1.ToString();
        }
//============================================================================================================
        private void btn_ShowPrefix_Click(object sender, EventArgs e)
        {

            ClassStack SampleStack2 = new ClassStack();
            object MyTop2 = null;
            object MyTop_PP2 = null;
            string str2 = txt_EnterString.Text;
            string CapacityPostfix2 = "";
            bool Num2 = true;
            for (int i = (str2.Length-1); i >=0; i--)
            {
                switch (str2[i])
                {
                    case '+':
                        while (Num2)
                        {
                            MyTop2 = SampleStack2.Test_Top();
                            if (SampleStack2.IsEmpty())
                            {
                                SampleStack2.Push(str2[i]);
                                break;
                            }
                            else if ((char)MyTop2 == '*')
                            {
                                MyTop_PP2 = SampleStack2.Pop();
                                CapacityPostfix2 += MyTop_PP2;
                            }
                            else if ((char)MyTop2 == '/')
                            {
                                MyTop_PP2 = SampleStack2.Pop();
                                CapacityPostfix2 += MyTop_PP2;
                            }
                            else if ((char)MyTop2 == '-')
                            {
                                MyTop_PP2 = SampleStack2.Pop();
                                CapacityPostfix2 += MyTop_PP2;
                            }
                            else if ((char)MyTop2 == '+')
                            {
                                MyTop_PP2 = SampleStack2.Pop();
                                CapacityPostfix2 += MyTop_PP2;
                            }
                        }
                        break;


                    case '-':
                        while (Num2)
                        {
                            MyTop2 = SampleStack2.Test_Top();
                            if (SampleStack2.IsEmpty())
                            {
                                SampleStack2.Push(str2[i]);
                                break;
                            }
                            else if ((char)MyTop2 == '*')
                            {
                                MyTop_PP2 = SampleStack2.Pop();
                                CapacityPostfix2 += MyTop_PP2;
                            }
                            else if ((char)MyTop2 == '/')
                            {
                                MyTop_PP2 = SampleStack2.Pop();
                                CapacityPostfix2 += MyTop_PP2;
                            }
                            else if ((char)MyTop2 == '-')
                            {
                                MyTop_PP2 = SampleStack2.Pop();
                                CapacityPostfix2 += MyTop_PP2;
                            }
                            else if ((char)MyTop2 == '+')
                            {
                                MyTop_PP2 = SampleStack2.Pop();
                                CapacityPostfix2 += MyTop_PP2;
                            }
                        }
                        break;

                    case '/':
                        while (Num2)
                        {
                            MyTop2 = SampleStack2.Test_Top();
                            if (SampleStack2.IsEmpty())
                            {
                                SampleStack2.Push(str2[i]);
                                break;
                            }
                            else if ((char)MyTop2 == '+')
                            {
                                MyTop_PP2 = SampleStack2.Pop();
                                CapacityPostfix2 += MyTop_PP2;
                            }
                            else if ((char)MyTop2 == '/')
                            {
                                MyTop_PP2 = SampleStack2.Pop();
                                CapacityPostfix2 += MyTop_PP2;
                            }
                            else if ((char)MyTop2 == '-')
                            {
                                SampleStack2.Push(str2[i]);
                                break;
                            }
                            else if ((char)MyTop2 == '*')
                            {
                                SampleStack2.Push(str2[i]);
                                break;
                            }
                        }
                        break;

                    case '*':
                        while (Num2)
                        {
                            MyTop2 = SampleStack2.Test_Top();
                            if (SampleStack2.IsEmpty())
                            {
                                SampleStack2.Push(str2[i]);
                                break;
                            }
                            else if ((char)MyTop2 == '*')
                            {
                                MyTop_PP2 = SampleStack2.Pop();
                                CapacityPostfix2 += MyTop_PP2;
                            }
                            else if ((char)MyTop2 == '-')
                            {
                                MyTop_PP2 = SampleStack2.Pop();
                                CapacityPostfix2 += MyTop_PP2;
                            }
                            else if ((char)MyTop2 == '/')
                            {
                                SampleStack2.Push(str2[i]);
                                break;
                            }
                            else if ((char)MyTop2 == '+')
                            {
                                SampleStack2.Push(str2[i]);
                                break;
                            }
                        }
                        break;
                    default:
                        CapacityPostfix2 += str2[i];
                        break;
                }
            }
            while (Num2)
            {
                if (SampleStack2.IsEmpty())
                    break;
                else
                    CapacityPostfix2 += SampleStack2.Pop();
            }
            txt_ShowResultPrefix.Text = CapacityPostfix2.ToString();
        }        
    }
}

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