package t07Str;
public class Demo02 {
public static void main(String[] args) {
System.out.println(fun01("9999" , "9999"));
}
private static String fun01(String n1Str , String n2Str) {
if(!n1Str.matches("\\d+") || !n2Str.matches("\\d+")) {
return "Error";
}
String sb1R = new StringBuilder(n1Str).reverse().toString();
String sb2R = new StringBuilder(n2Str).reverse().toString();
int len1 = n1Str.length() ;
int len2 = n2Str.length() ;
if(len1 != len2) {
int dLength = len1 - len2 > 0 ? len1 - len2 : len2 - len1 ;
if(len1 > len2 ) {
for(int i = 0 ; i < dLength ; i++) {
sb2R += "0" ;
}
}else {
for(int i = 0 ; i < dLength ; i++) {
sb1R += "0" ;
}
}
}
char[] charArray1 = sb1R.toCharArray();
char[] charArray2 = sb2R.toCharArray();
boolean flag = false ;
String result = "" ;
for(int i = 0 ; i < charArray1.length ; i++) {
int tempSmalSum = Integer.parseInt(charArray1[i]+"") + Integer.parseInt(charArray2[i]+"") + (flag ? 1 : 0);
if(tempSmalSum > 9) {
flag = true ;
tempSmalSum -= 10 ;
}
result += (tempSmalSum+"");
}
if(flag)
result += "1";
return new StringBuilder(result).reverse().toString();
}
}
