Long String Number addition

Long string numbers added

Import Java.util.regex.Pattern; /** * @author Clydelou * * */public class Test {/** * @param args/public static string sum (string s, String t) {patter N pattern = pattern.compile ("[0-9]+?"); if (!pattern.matcher (s). Matches () | |!pattern.matcher (t). Matches ()) {System.out.println ("Error"); System.out.println ("s =/" "+s+"/", T =/" "+t+"/""); Return "";} else {StringBuilder sb = new StringBuilder (); int length0 = S.length (); int length1 = T.length (); s = new StringBuilder (s ). Reverse (). toString (); t = new StringBuilder (t). Reverse (). toString (); int min = (Length0 > length1 length1:length0); Boolean flag = (Length0 > length1? true:false); int temp = 0; for (int i = 0; i < min. i++) {char x = S.charat (i); char y = T.charat (i); int result = X-' 0 ' + y-' 0 ' + temp; int R1 = result% 10; temp = RESULT/10; Sb.append (R1); } if (flag) {while (temp!= 0 && min < length0) {int result = S.charat (min)-' 0 ' + temp. int r1 = result% 1 0; temp = RESULT/10; Sb.append (R1); min++; } if (min < length0) {String str = s.substring (min, length0); Sb.append (str);} if (temp!= 0) {sb.append (temp);} else {while (temp!= 0 && min < length1) {int result = T.charat (min)-' 0 ' + temp. int r1 = result% tem p = RESULT/10; Sb.append (R1); min++; } if (min < length1) {String str = t.substring (min, length1); Sb.append (str);} if (temp!= 0) {sb.append (temp);} Return Sb.reverse (). toString (); } public static void Main (string[] args) {//TODO auto-generated method stub String s = "21341234568787667776768685"; s Tring t = "557467674876856785678987464"; String m = "999999999"; String n = "999999999"; System.out.println (sum (S, t)); System.out.println (SUM (t, s)); System.out.println (SUM (m, n)); System.out.println (SUM ("a", "1")); } }