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This is the program for Simulation of an Error Correction Code (Like CRC).

Author: FariyaRahmath

Crc.java

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+import java.io.*;
+import java.net.*;
+class Crc
+{
+	public static void main(String args[]) throws IOException
+	{
+		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
+		System.out.println("\nEnter Generator: ");
+		String gen=br.readLine();
+		System.out.println("\nEnter data: ");
+		String data=br.readLine();
+		String code=data;
+		while(code.length()<(data.length()+gen.length()-1))
+		code=code+"0";
+		code=data+div(code,gen);
+		System.out.println("\nThe transmitted code word is: "+code);
+		System.out.println("\nPlease enter the received code word: ");
+		String rec=br.readLine();
+		if(Integer.parseInt(div(rec, gen))==0)
+		System.out.println("\nThe received code word contains NO Errors\n");
+		else
+		System.out.println("\nThe received code word contains Errors\n");
+	}
+	static String div(String num1, String num2)
+	{
+		int pointer=num2.length();
+		String result=num1.substring(0, pointer);
+		String remainder=" ";
+		for (int i=0; i<num2.length(); i++)
+		{
+			if (result.charAt(i)==num2.charAt(i))
+			remainder+="0";
+			else
+			remainder+="1";
+		}
+		while(pointer<num1.length())
+		{
+			if(remainder.charAt(0)=='0')
+			{
+				remainder=remainder.substring(1, remainder.length());
+				remainder=remainder+String.valueOf(num1.charAt(pointer));
+				pointer++;
+			}
+			result=remainder;
+			remainder=" ";
+			for(int i=0; i<num2.length(); i++)
+			{
+				if (result.charAt(i)==num2.charAt(i))
+				remainder+="0";
+				else
+				remainder+="1";
+			}
+		}
+		return remainder.substring(1, remainder.length());
+	}
+}