This is a program written in bluej to convert a number from binary to decimal.Can someone explain me this?

The program to convert binary to decimal is as followsimport java.io.*;


class bcd


{


int k; // instance variable


bcd() // Default Constructor


{


k = 0;


}


public bcd(int n) // parameterised constructor


{


k=n;


}


private void disp()


{


int x[]=new int[32];


if(k%26gt;99999999 || k%26lt;0)


{


System.out.println("Number should be only of eight digit and it should be positive");


return;


}


int rem,r;


int y[]={0,0,0,0}; // array of size 4 taken to store a digit when converted into binary


int z=0;





System.out.print(k+" = ");


while(k%26gt;0)


{


rem=k%10; //Extracting the digits from decimal number


k=k/10;


for(int i=0;i%26lt;4;i++)


{


r=rem%2; // Convering the extracted digit into Binary


rem=rem/2;


y[i]=r;


}


for(int j=0;j%26lt;4;j++)


{


x[z]=y[j];





z++;


}


}





for(int j=31;j%26gt;=0;j--)


{


System.out.print(x[j]);


if(j%4==0)


System.out.print(" ");


} // closing of for loop





} // closing of disp method


public static void main()throws IOException


{


char c; // used to store 'y' or 'n' for continuing or terminating the program


do


{





BufferedReader br=new BufferedReader(new InputStreamReader(System.in));





System.out.println("*************** MENU ******************\n");





System.out.println("Enter 1 to display BCD equivalent of any eight digit Number\n ");


System.out.println("Enter 2 to perform BCD Addition of Two Numbers\n ");


System.out.println("Enter 3 to perform BCD Subtractionaddition of Two Numbers\n");


System.out.print(" Enter your choice : ");


int y=Integer.parseInt(br.readLine());


switch(y)





{


case 1: System.out.print("Enter The No. : ");


int lim=Integer.parseInt(br.readLine());


bcd B=new bcd(lim);


if(lim%26gt;99999999 || lim%26lt;0)


{


System.out.println("Number should be only of eight digit ");








}


else


{





System.out.println("\n\t\tBCD Equivalent\n");


B.disp();


}


break;


case 2: System.out.print("Enter First No. : ");


int n=Integer.parseInt(br.readLine());


System.out.print("Enter Second No. : ");


int m=Integer.parseInt(br.readLine());





int z = n+m;


bcd C=new bcd(z);


System.out.println(" \n\t\tBCD Addition : \n");


C.disp();





break;


case 3: System.out.print("Enter First No. : ");


int x=Integer.parseInt(br.readLine());


System.out.print("Enter Second No. : ");


int a=Integer.parseInt(br.readLine());





int w = x-a;


bcd D=new bcd(w);


System.out.println(" \n\t\tBCD Subtraction : \n");


D.disp();





break;








default : System.out.println("Invalid choice");


} // closing of switch case


System.out.print("\nDo you want to continue ? Press y/n :\t");


c=(char)br.read();


}while(c!='n'); // closing of do-while loop


} // closing of main function


} // closing of class|||Sorry, this program does not convert from binary to decimal. If you look at the main() program menu, you will see that it offers the choices of converting a decimal number into BCD or of doing BCD arithmetic. BCD is a coding system in which each decimal digit is individually coded into binary, thus


decimal 16


binary 0001 0000


BCD 0001 0110