what is namespace in cpp application

1//consoleapplication4.cpp : 定义控制台应用程序的入口点.

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

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

h>#include ctime>usingnamespacestd;stringrandomshuffle(string

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

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