using namespace std vs std::cout

vs2017 "cout": 未声明的标识符 有using namespace std

01 最佳答案 你把头文件换成 iostream> 再用个using namespace std

为什么我用了#include iostream> using namespace std;还是有错

iostream>usingnamespacestd;classbase1{public:virtualvoidf(){cout

*/ #include iostream> using namespace std;int main(){cout "

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