蓝桥杯——高精度加法

package first_package;

import java.util.*;
import java.lang.Math;
public class Main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner inScanner = new Scanner(System.in);
		String a = inScanner.next();
		String b = inScanner.next();
		String c =  new String();
		int temporary = 0;
		int sum=0;
		int indexa = 0;
		int indexb =0;
		for(int i =1; i<=Math.max(a.length(),b.length());i++){
			indexa  = a.length()-i;
			indexb = b.length()-i;
			if(i <= Math.min(a.length(),b.length())){
				sum =  Character.getNumericValue(a.charAt(indexa))+ Character.getNumericValue(b.charAt(indexb))+temporary;
				c =String.valueOf(sum%10)+ c;
				temporary = sum/10;
			}
			else if(indexa<0){
				sum = Character.getNumericValue(b.charAt(indexb)) + temporary;
				c =String.valueOf(sum%10)+ c;
				temporary = sum/10;
			}
			else{
				sum = Character.getNumericValue(a.charAt(indexa)) + temporary;
				c =String.valueOf(sum%10)+ c;
				temporary = sum/10;
			}
		}
		if (temporary >0){
			c =String.valueOf(temporary%10)+ c;
		}
		System.out.print(c);
	}

}