C++ 读作“C加加”，是“C Plus Plus”的简称。顾名思义，C++ 是在C语言的基础上增加新特性，玩出了新花样，所以叫“C Plus Plus”，就像 iPhone 7S 和 iPhone 7、Win10 和 Win7 的关系。
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1.1.1 学习C++之前要先学习C语言吗？
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HTML 全局属性
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HTML自定义input[type="file"]的CSS样式
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HTML 参考手册- (HTML5 标准)
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