fork(1) download
copy 
  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10.  
  11. 	public static void add(String a,String b){
  12.     StringBuilder buf = new StringBuilder();
  13.     if((a.length() - 1==0)&&(a.charAt(0)=='0')){
  14.         System.out.println(b);
  15.         return;
  16.     }
  17.     if((b.length() - 1==0)&&(b.charAt(0)=='0')){
  18.         System.out.println(a);
  19.         return;
  20.     }
  21.     else{
  22.     for ( int i1 = a.length() - 1, i2 = b.length() - 1, carry = 0;
  23.           (i1 >= 0 || i2 >= 0) || carry != 0;i1--, i2-- ) {
  24.         int digit1 = i1 < 0 ? 0 :
  25.                      Integer.parseInt(Character.toString(a.charAt(i1)));
  26.         int digit2 = i2 < 0 ? 0 :
  27.                      Integer.parseInt(Character.toString(b.charAt(i2)));
  28.  
  29.         int digit = digit1 + digit2 + carry;
  30.         if (digit > 9) {
  31.             carry = 1;
  32.             digit -= 10;
  33.         } else {
  34.             carry = 0;
  35.         }
  36.  
  37.         buf.append(digit);
  38.     }
  39.    }
  40.     System.out.println(buf.reverse().toString());
  41. }
  42.  
  43.  
  44. 	public static void main (String[] args) throws java.lang.Exception
  45. 	{
  46. 		add("12345", "321");
  47. 		System.out.println(12345+321);
  48. 		add("123", "987");
  49. 		System.out.println(123+987);
  50. 	}
  51. }
Success #stdin #stdout 0.07s 380160KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
12666
12666
1110
1110
https://ideone.com/swro1M
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!