C# - Infix to Postfix Conversion
I have given here the source code in C# for InFix to PostFix Conversion with the help of Stack (Last In First Out) Data Struct implementation.
Source Code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Infix
{
class Program
{
static bool InfixToPostfixConvert(ref string infixBuffer, out string postfixBuffer)
{
int priority = 0;
postfixBuffer = "";
Stack<Char> s1 = new Stack<char>();
for (int i = 0; i < infixBuffer.Length; i++)
{
char ch = infixBuffer[i];
if (ch == '+' || ch == '-' || ch == '*' || ch == '/')
{
// check the precedence
if (s1.Count <= 0)
s1.Push(ch);
else
{
if (s1.Peek() == '*' || s1.Peek() == '/')
priority = 1;
else
priority = 0;
if (priority == 1)
{
if (ch == '+' || ch == '-')
{
postfixBuffer += s1.Pop();
i--;
}
else
{ // Same
postfixBuffer += s1.Pop();
i--;
}
}
else
{
if (ch == '+' || ch == '-')
{
postfixBuffer += s1.Pop();
s1.Push(ch);
}
else
s1.Push(ch);
}
}
}
else
{
postfixBuffer += ch;
}
}
int len = s1.Count;
for (int j = 0; j < len; j++)
postfixBuffer += s1.Pop();
return true;
}
static void Main(string[] args)
{
string infixBuffer = "";
string postfixBuffer = "";
if (args.Length == 1)
{
infixBuffer = args[0];
InfixToPostfixConvert(ref infixBuffer, out postfixBuffer);
System.Console.WriteLine("InFix :\t" + infixBuffer);
System.Console.WriteLine("PostFix:\t" + postfixBuffer);
}
else
{
infixBuffer = "a+b*c";
InfixToPostfixConvert(ref infixBuffer, out postfixBuffer);
System.Console.WriteLine("InFix :\t" + infixBuffer);
System.Console.WriteLine("PostFix:\t" + postfixBuffer);
System.Console.WriteLine();
infixBuffer = "a+b*c/d-e";
InfixToPostfixConvert(ref infixBuffer, out postfixBuffer);
System.Console.WriteLine("InFix :\t" + infixBuffer);
System.Console.WriteLine("PostFix:\t" + postfixBuffer);
System.Console.WriteLine();
infixBuffer = "a+b*c/d-e+f*h/i+j-k";
InfixToPostfixConvert(ref infixBuffer, out postfixBuffer);
System.Console.WriteLine("InFix :\t" + infixBuffer);
System.Console.WriteLine("PostFix:\t" + postfixBuffer);
System.Console.WriteLine();
}
}
}
}
Output
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