Question

class Point { public: Point() { myX = myY = 0; } Point(int n, int y) { myx = x; myy = y; } int getX() const { return myX; } int getY() const { return myY; } virtual void read(istream& in) { in >> myX >> myY; } private: int myx, myY; }; class Point3D : Public Point { public: Point3D() : Point() { myZ = 0; } Point3D(int x, int y, int z) : Point(x, y) { my Z = z; } int getz) const { return my2; } private: int myz; void testRead() { cout << "Testing read().." << endl; cout << "- Enter 11 22: " << flush; Point p1; p1.read(cin); assert( pl.getX() == 11 ); assert( pl.getY() == 22 ); cout <<"--- Passed! " << endl; cout << "- Enter 33 44 55: " << flush; Point3D p2; p2.read(cin); assert p2.getX() -- 33 ); assert p2.getY() -- 44 ); assert p2.getz) - 55 ); cout << " Passed!" << endl; The test-method compiles and runs, but when executed, it generates the output below. (Red, underlined text is what the user has entered.) Testing read()... - Enter 11 22: 11 22 --- Passed! - Enter 33 44 55: 33 44 55 ../testi.cpp:87: failed assertion 'p2.getz() -- 55'

Why is the assertion failing? what code can fix the problem and where should that code be located at?

Answer 1

read method is reading only and x and y values in Point class so when your calling read () on p2 it is not reading the z value because read() is not available in the Point3D class
so it is not reading n assigning the value to z so override the read in Point3D class and read all 3 values

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