operations-lcci

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LCCI

Write methods to implement the multiply, subtract, and divide operations for integers. The results of all of these are integers. Use only the add operator.

You should implement following methods:

<ul>
	<li><code>Operations()</code>&nbsp; constructor</li>
	<li><code>minus(a, b)</code>&nbsp; Subtraction, returns&nbsp;<code>a - b</code></li>
	<li><code>multiply(a, b)</code>&nbsp; Multiplication, returns&nbsp;<code>a * b</code></li>
	<li><code>divide(a, b)</code>&nbsp; Division, returns&nbsp;<code>a / b</code></li>
</ul>

Example: 

<pre>
Operations operations = new Operations();
operations.minus(1, 2); //returns -1
operations.multiply(3, 4); //returns 12
operations.divide(5, -2); //returns -2
</pre>

Note: 

<ul>
	<li>You can assume inputs are always valid, that is, e.g., denominator will not be 0 in division.</li>
	<li>The number of calls will not exceed 1000.</li>
</ul>

Operations LCCI

Design

Math

请实现整数数字的乘法、减法和除法运算，运算结果均为整数数字，程序中只允许使用加法运算符和逻辑运算符，允许程序中出现正负常数，不允许使用位运算。
你的实现应该支持如下操作：
<ul>
<li><code>Operations()</code> 构造函数</li>
<li><code>minus(a, b)</code> 减法，返回<code>a - b</code></li>
<li><code>multiply(a, b)</code> 乘法，返回<code>a * b</code></li>
<li><code>divide(a, b)</code> 除法，返回<code>a / b</code></li>
</ul>
示例：
<pre>Operations operations = new Operations();
operations.minus(1, 2); //返回-1
operations.multiply(3, 4); //返回12
operations.divide(5, -2); //返回-2
</pre>
提示：
<ul>
<li>你可以假设函数输入一定是有效的，例如不会出现除法分母为0的情况</li>
<li>单个用例的函数调用次数不会超过1000次</li>
</ul>