Java数据类型之细讲char类型与编码关系

 public static long divideUnsigned(long dividend, long divisor) {
        //divisor是除数
        //而divident是被除数
        
        //首先判断除数是否为Unsigned（<0就代表为unsigned，只不过将符号位看成1，变为负数）
        if (divisor < 0L) { // signed comparison
            // Answer must be 0 or 1 depending on relative magnitude
            // of dividend and divisor.
            
            //可以看到这里的返回值只有0和1
            //这是因为除数为unsigned，根据整形的向下取整规则
            //得到的结果只能为1和0（dividend大于divisor就为1，小于就为0）
            //dividend不可能为divisor的两倍（因为位数不过）
            return (compareUnsigned(dividend, divisor)) < 0 ? 0L :1L;
        }

        //如果除数不是Unsigned，那么就判断被除数
        
        if (dividend<strong style="color:transparent">来2源gaodaima#com搞(代@码&网</strong> > 0) //  Both inputs non-negative
            //如果被除数不是Unsigned，就直接除就好
            return dividend/divisor;
        else {
            /*
             * For simple code, leveraging BigInteger.  Longer and faster
             * code written directly in terms of operations on longs is
             * possible; see "Hacker's Delight" for divide and remainder
             * algorithms.
             */
             //如果是，那么就将除数和被除数换成更高位的BigInt型，去进行
           
            return toUnsignedBigInteger(dividend).
                divide(toUnsignedBigInteger(divisor)).longValue();
        }
    }