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std命名空间使用指南
1、 创建项目,命名为std命名空间的使用,具体所示。 2、 新建一个名为 std.cpp 的文件,内容所示。 3、 包含头文件 iostream,并编写 main 函数,结构如示例所示。 4、 using namespace std; 的作用是引入标准命名空间,方便直接使用其中的标识符而无需加限定前缀。
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