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For the following code, identify all feasible paths, path tests, and data ow tests: cin >> a >> b >> c; // node A x = 5; y = 7; if ( a > b && b > c) { a = a + 1; // node B x = x + 6; if ( a = 10 || b > 20) { b = b + 1; // node C x = y + 4; } if (a < 10 || c = 20) { // node D b = b + 2; // node E y=4 } a = a + b + 1; // node F y = x + y; } if (a > 5 || c < 10) { // node G b = c + 5; // node H x = x + 1; } cout >> x >> y; // node I.

<< "X::f() executing\n";

class Y : public X { public: void f() { tout << "Y::f() executing\n"; int a;

But the members of Y have the same signatures as those in X. So Y'S member function f ( ) the f ( ) defined in X, and Y'S data member a dominates the a defined in X.

Here is a test driver for the two classes:

15. Given the following code, draw the CFG and generate a minimal set of test cases for each of the following criteria: C0, C1, dpu, and dcu. cin>> a >> b // node A if (b>a) { x = b; // node B if (b>20) { x = x + 9; // node C } else { x = x + 1; // node D } x = x + 1; // node E } else { x = a // node F if (a > 20_ { x = x + 15; // node G } x = x 5; // node H } if (b > a + 20) // node I { x = 20; // node J } cout << x; // node K

x x;

x.a = 22; x-w; tout << 'x.a = ' c-c x.a CC endl; y y; y.a = 44; // assigns y.x: :a = 66; // assigns // invokes y.fO; y.X::f(); // invokes tout << I' y . a = I' C-K y.a CC endl; tout -C-C "y.X::a = ' C-C y.X::a << endl; x z = y; tout << '1z.a = cc z.a << endl;

Here, y has access to two different data members named a and two different functions f ( ) . The defaults are the ones defined in the derived class Y. The scope resolution operator : : is used in the form x: : to override the defaults to access the corresponding members defined in the parent class X. When the x object z and initialized with y, its x members are used: z . a is assigned the value y.X::a. This diagram illustrates the three objects x, y, and z:

Example 11.6 and most of the remaining examples in this chapter are designed to illustrate the intricacies of inheritance. They are not intended to exemplify common programming practice. Instead, they focus on specific aspects of C++ which can then be applied to more general and practical situations. In particular, the method of dominating data members as illustrated in Example 11.6 is rather unusual. Although it is not uncommon to override function members, dominating data members of the same type is rare. More common would be the reuse of the same data name with a different type, like this:

1. What are the basic concerns with software testing The basic concerns are how to select test cases and when to stop testing. 2. Why is a speci cation needed in order to do testing A speci cation is needed to decide when the actual behavior is correct or incorrect. 3. Why is path testing usually impractical Most programs have an in nite number of possible paths through the program.

CHAP. 1 l]

In an inheritance hierarchy, default constructors and destructors behave differently from other member functions. As the following example illustrates, each constructor invokes its parent constructor before executing itself, and each destructor invokes its parent destructor after executing itself:

class X { public: x() { tout << 'X::X() constructor -x(> { tout << "X::X() destructor 1 ; class Y : public X { public: Y() { tout << 'Y::Y() constructor -Y() { tout << "Y::Y() destructor 1 ;

executing\n'; executing\n';