Divide Two Integers
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Divide two integers without using multiplication, division and mod operator.
解答：
public int divide(int dividend, int divisor) {boolean negative = (dividend<0 && divisor>0) ||(dividend>0 && divisor<0);int result = 0;long div_dividend = Math.abs((long)dividend);//Math.abs(-2147483648)的结果为-2147483648，这是因为溢出的原因，因此这里一定先要做类型转换才行long div_divisor = Math.abs((long)divisor);while(div_dividend >= div_divisor) {int shift = 0;while( (div_divisor<<shift) <= div_dividend ) {++shift;}--shift;result += (1<<shift);div_dividend -= (div_divisor<<shift);}return negative? -result : result; }这道题一定要注意整数溢出的问题
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