what is namespace in cpp programming

cpp #include iostream> using namespace std; int main() { cout

h>usingnamespacestd;classstring{public:string(constchar*str){if

h>usingnamespacestd;stringreverse(string s){if(s==""){return"";}

示例1:对象数组要求:定义coordinate类数据成员: m_ix和m_iy给数组中

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