C++ examples for Class:static member
Use the static variable to track total
#include <iostream> using namespace std; class RoomDimension { private:/*from w ww.ja va2 s . c om*/ static double TotalSqFootage; // static variable declaration double length; double width; public: RoomDimension(double = 0.0, double = 0.0); // constructor void resetDimension(double, double); // mutator }; // static variable definition double RoomDimension::TotalSqFootage = 0.0; // implementation section RoomDimension::RoomDimension(double l, double w) // constructor { length = l; width = w; TotalSqFootage += l * w; cout << "The total square footage is now " << TotalSqFootage << endl; } void RoomDimension::resetDimension(double len = 0.0, double wid = 0.0) { TotalSqFootage = length * width; // remove previous square footage length = len; width = wid; TotalSqFootage += len * wid; // add new square footage cout << "The total square footage is now " << TotalSqFootage << endl; } int main() { RoomDimension Kitchen(20.0, 15.0); // declare RoomDimension object RoomDimension Hall(25.0, 4.0); // declare a second RoomDimension object Hall.resetDimension(10, 5); return 0; }