[游戏开发]67. Add Binary

brutal force：

  public String addBinary(String a, String b) {
        String result="";
        int aStrLength=a.length();
        int bStrLength=b.length();

        String shortStr;
        String longStr;

        int shortStrLength;
        int longStrLength;

        int remainder=0;
        int carry=0;

        if(aStrLength<bStrLength){
            shortStr=a;
            longStr=b;

            shortStrLength=aStrLength;
            longStrLength=bStrLength;

        }else{
            shortStr=b;
            longStr=a;
            shortStrLength=bStrLength;
            longStrLength=aStrLength;
        }
        for(int i=0;i<shortStrLength;i++){
            remainder=((shortStr.charAt(shortStrLength-i-1)-'0')+(longStr.charAt(longStrLength-i-1)-'0')+carry)%2;
            result+=(char)(remainder+'0');
            carry=((shortStr.charAt(shortStrLength-i-1)-'0')+(longStr.charAt(longStrLength-i-1)-'0')+carry)/2;
        }

        for(int i=longStrLength-shortStrLength-1;i>-1;i--){
            remainder=(longStr.charAt(i)-'0'+carry)%2;
            result+=(char)(remainder+'0');
            carry=(longStr.charAt(i)-'0'+carry)/2;
        }

        if(carry==1)
            result+=(char)(1+'0');

        StringBuffer stringBuffer=new StringBuffer(result);
        result=stringBuffer.reverse().toString();

        return result;
    }

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