Binary Addition Using BlueJ Program

How to proceed in the binary addition program

This BlueJ program is on addition of two binary numbers. In this program, we will take two binary numbers in two string objects. The smaller string object will be stored on 'bin1' and the greater or same string object will be stored on 'bin2'. Here length of the strings are considered for smaller or greater strings.

Then characters from the end of both string objects are extracted and numeric addition is done on both of them. If the result exceeds 1, it will be reset on 0,1 will be carried forward and the result will be concatenated with another string object 'str'. Ultimately 'str' will be displayed from reverse direction..

import java.io.*;
class Blue
{
public static void main(String args[])throws IOException
{
Blue ob=new Blue();
ob.take();
}
public void take()throws IOException
{
String bin1,bin2;
int i,a,b,c,len1,len2,flag=0;
String str=" ",str1;
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter 1st binary Number:");
bin1=br.readLine().trim();
System.out.println("Enter 2nd binary Number:");
bin2=br.readLine().trim();
if(bin1.length()>bin2.length())
{
str1=bin1;
bin1=bin2;
bin2=str1;
}
len1=bin1.length()-1;
len2=bin2.length()-1;
for(i=len1;i>=0;i--)
{
a=bin1.charAt(i)-48;
b=bin2.charAt(len2)-48;
len2--;
c=a+b+flag;
flag=0;
if(c>1)
{
c=0;
flag=1;
}
str=str+c;
}
if(len2==-1 && flag==1)
str=str+flag;
else
{
for(i=len2;i>=0;i--)
{
a=bin2.charAt(i)-48;
c=a+flag;
flag=0;
str=str+c;
}
}
str=str.trim();
len1=str.length()-1;
System.out.println("Sum of the binary numbers are:");
for(i=len1;i>=0;i--)
System.out.print(str.charAt(i));
}
}

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