Java program to perform complex number addition

import java.io.*; class complex {    int r,i;    complex() {    r =0;    i=0; }   void sum(complex c,complex d) { complex a=new complex(); a.r=c.r+d.r; a.i=c.i+d.i;      System.out.println("The sum is "+a.r+"+"+a.i+"i");   }   void read()throws IOException   {  BufferedReader br=new BufferedReader(new InputStreamReader(System.in));   System.out.println("\nEnter the real part");    r=Integer.parseInt(br.readLine());   System.out.println("\nEnter the imaginary part");     i=Integer.parseInt(br.readLine());   System.out.println("\nYou have entered : "+r+"+"+i+"i");   }   public static void main(String s[])throws IOException   {       complex c=new complex();      complex d=new complex();      System.out.println("First number");      c.read();      System.out.println("\nSecond number");      d.read();      d.sum(c,d);   } } Output