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定义变量，然后把结果赋值给变量，为什么不可以？
给你找了一篇中文的资料，讲的还算详细
http://www.cnblogs.com/Engin/archive/2011/08/28/2156346.html
谢谢，之前之所以没有赋值成功可能是头文件的问题！
