Topic: write a class, declare a data member and a static data members; Declare a static member function to output the static data members, requires the use of constructors to initialize the data members and add 1 static data members, use the destructor to static data members, minus 1, in the main function with two kinds of method calls the static member function,

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Int test: : b=0; Static members need to be on the outside of the class initialization,
The static void printb (); Need to add function return value,