A lawyer，an engineer and a mathematician were called in for a test.The engineer went in first and was asked，“What is 2+2？”
The engineer thought a while and finally answered，“4.”
Then the mathematician was called in and was asked the same question.With little thought he replied，“4.0.”
Then the lawyer was called in，and was asked the same question.The lawyer answered even quicker than the mathematician，“What do you want it to be？”
一个律师、一个工程师和一个数学家被叫来参加一项考试。工程师第一个进来，问他的问题是“二加二等于几？”工程师想了一会儿，最后说：“等于四。”
接着，数学家被叫进来，问同一个问题。他想也不想就回答说“等于四点零”。
最后，律师被叫进来，问同一个问题。他甚至比数学家回答得还要快：“你想要它等于几？”
mathematician n.数学家