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108 lines
3.7 KiB
C#
108 lines
3.7 KiB
C#
/*
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* C# Program to Convert Infix to Postfix
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*/
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace Infix
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{
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class Program
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{
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static bool convert(ref string infix, out string postfix)
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{
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int prio = 0;
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postfix = "";
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Stack<Char> s1 = new Stack<char>();
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for (int i = 0; i < infix.Length; i++)
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{
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char ch = infix[i];
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if (ch == '+' || ch == '-' || ch == '*' || ch == '/')
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{
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if (s1.Count <= 0)
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s1.Push(ch);
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else
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{
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if (s1.Peek() == '*' || s1.Peek() == '/')
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prio = 1;
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else
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prio = 0;
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if (prio == 1)
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{
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if (ch == '+' || ch == '-')
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{
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postfix += s1.Pop();
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i--;
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}
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else
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{
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postfix += s1.Pop();
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i--;
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}
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}
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else
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{
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if (ch == '+' || ch == '-')
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{
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postfix += s1.Pop();
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s1.Push(ch);
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}
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else
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s1.Push(ch);
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}
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}
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}
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else
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{
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postfix += ch;
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}
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}
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int len = s1.Count;
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for (int j = 0; j < len; j++)
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postfix += s1.Pop();
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return true;
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}
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static void Main(string[] args)
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{
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string infix = "";
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string postfix = "";
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if (args.Length == 1)
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{
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infix = args[0];
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convert(ref infix, out postfix);
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System.Console.WriteLine("InFix :\t" + infix);
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System.Console.WriteLine("PostFix:\t" + postfix);
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}
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else
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{
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infix = "a+b*c-d";
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convert(ref infix, out postfix);
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System.Console.WriteLine("InFix :\t" + infix);
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System.Console.WriteLine("PostFix :\t" + postfix);
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System.Console.WriteLine();
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infix = "a+b*c-d/e*f";
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convert(ref infix, out postfix);
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System.Console.WriteLine("InFix :\t" + infix);
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System.Console.WriteLine("PostFix :\t" + postfix);
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System.Console.WriteLine();
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infix = "a-b/c*d-e--f/h*i++j-/k";
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convert(ref infix, out postfix);
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System.Console.WriteLine("InFix :\t" + infix);
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System.Console.WriteLine("PostFix :\t" + postfix);
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System.Console.WriteLine();
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Console.ReadLine();
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}
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}
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}
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}
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/*
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Infix : a+b*c-d
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Postfix : abc*+d-
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Infix : a+b*c-d/e*f
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Postfix : abc*+de/f*-
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Infix : a-b/c*d-e--f/h*I++j-/k
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Postfix : abc/d*-e--fh/I*-=j=k/- |