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public class Test{
public static String addBigNum(String str1,String str2){
//ÕÒ³öÁ½×Ö·û´®µÄ³¤¶Ì£¬·½±ãºó±ßÒýÓã»
String longer = str1.length() > str2.length()? str1 : str2;
String shorter = str1.length() < str2.length()? str1 : str2;
int[] a = new int[longer.length()];
int temp = shorter.length();
int rise = 0;
int m , n ;
StringBuffer sb = new StringBuffer();
for(int i = a.length - 1 ; i >= 0 ; i--){
if((i - a.length + temp) >= 0 ){
m = Integer.parseInt(String.valueOf(longer.charAt(i)));
n = Integer.parseInt(String.valueOf(shorter.charAt(i - a.length + temp)));
a[i] = (m + n + rise) % 10;
rise = (m + n + rise) / 10;
} else {
a[i] = (Integer.parseInt(String.valueOf(longer.charAt(i))) + rise) % 10;
rise = (Integer.parseInt(String.valueOf(longer.charAt(i))) + rise) / 10;
}
}
for (int i = 0; i < a.length; i++) {
sb.append(String.valueOf(a[i]));
}
return new String(sb);
}
}
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