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  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.  
  12. 	//http://w...content-available-to-author-only...p.com/question?id=5727644228255744
  13.  
  14.  
  15.     public static String sumBinary(String s1, String s2) {
  16.  
  17. 	char[] a, b;
  18.  
  19. 	if(s1.length()>s2.length()){
  20. 	    a = s1.toCharArray();
  21. 	    b = s2.toCharArray();
  22. 	}else {
  23. 	    b = s1.toCharArray();
  24. 	    a = s2.toCharArray();
  25. 	}
  26.  
  27. 	int length = s1.length() > s2.length() ? s1.length() + 1 : s2.length() + 1;
  28. 	char[] sum = new char[length];
  29.  
  30. 	char c = '0';
  31.  
  32. 	int i = s1.length() - 1, j = s2.length() - 1; //for looks code easy
  33.  
  34.  
  35. 	while( i>=0 ) {
  36. 	    if(a[i] == '0' && c == '0') {
  37. 		if(j<0) sum[i+1] = '0';
  38. 		else
  39. 		    sum[i+1] = b[j];
  40.  
  41. 	    }else if(a[i] == '0' && c == '1') {
  42. 		if(j<0) {
  43. 		    sum[i+1] = '1';
  44. 		    c = '0';
  45. 		}else if(b[j] == '0') {
  46. 		    sum[i+1] = '1';
  47. 		    c = '0';
  48. 		}else{
  49. 		    sum[i+1] = '0';
  50. 		    c = '1';
  51. 		}
  52.  
  53. 	    }else if(a[i] == '1' && c == '1') {
  54. 		if(j<0) {
  55. 		    sum[i+1] = '0';
  56. 		    c = '1';
  57. 		}else if(b[j] == '0') {
  58. 		    sum[i+1] = '0';
  59. 		    c = '1';
  60. 		}else{
  61. 		    sum[i+1] = '1';
  62. 		    c = '1';
  63. 		}
  64.  
  65.  
  66. 	    }else if(a[i] == '1' && c == '0') {
  67. 		if(j<0) {
  68. 		    sum[i+1] = '1';
  69. 		    //c == '0';
  70. 		} else if(b[j] == '0') {
  71. 		    sum[i+1] = '1';
  72. 		}else {
  73. 		    sum[i+1] = '0';
  74. 		    c='1';
  75. 		}
  76.  
  77. 	    }
  78.  
  79.  
  80.  
  81.  
  82. 	    i--;
  83. 	    j--;
  84. 	}
  85.  
  86. 	if(c == '1') sum[0] = '1';
  87. 	//	System.out.println(sum);
  88.  
  89. 	return new String(sum); // or return sum?
  90.     }
  91.  
  92.     public static void main(String[] args) {
  93.  
  94.  
  95.         System.out.println(sumBinary("", ""));
  96.         System.out.println(sumBinary("0", "0"));
  97.         System.out.println(sumBinary("1", "1"));	
  98.         System.out.println(sumBinary("0111101", "0001101"));
  99. 	System.out.println(sumBinary("1111", "0000"));
  100. 	System.out.println(sumBinary("1010", "0101"));
  101. 	System.out.println(sumBinary("1111", "1111"));
  102.  
  103. 	System.out.println(sumBinary("1111", ""));
  104.  
  105. 	System.out.println(sumBinary("1111", "1"));
  106.  
  107. 	System.out.println(sumBinary("1111", "00"));
  108.  
  109. 	System.out.println(sumBinary("1111111111111111", "111"));
  110.  
  111.  
  112.     }
  113.  
  114.  
  115.  
  116.  
  117.  
  118.  
  119.  
  120.  
  121. }
Success #stdin #stdout 0.1s 320320KB
comments (?)
stdin 
Standard input is empty
stdout 

0
10
1001010
1111
1111
11110
1111
10000
1111
10000000000000110
https://ideone.com/I1c6fz
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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