At which time does the static_cast can be applied?
What is meant by type_info?
What is the output of this program?
1.
#include
2.
using namespace std;
3.
struct A
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{
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virtual void f()
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{
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cout << "Class A" << endl;
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}
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};
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struct B : A
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{
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virtual void f()
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{
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cout << "Class B" << endl;
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}
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};
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struct C : A
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{
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virtual void f()
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{
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cout << "Class C" << endl;
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}
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};
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void f(A* arg)
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{
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B* bp = dynamic_cast(arg);
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C* cp = dynamic_cast(arg);
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if (bp)
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bp -> f();
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else if (cp)
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cp -> f();
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else
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arg -> f();
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};
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int main()
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{
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A aobj;
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C cobj;
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A* ap = &cobj;
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A* ap2 = &aobj;
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f(ap);
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f(ap2);
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}
What is the output of this program?
1.
#include
2.
#include
3.
using namespace std;
4.
class A
5.
{
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public:
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virtual ~A();
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};
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int main()
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{
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A* a = NULL;
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try
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{
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cout << typeid(*a).name() << endl;
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}
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catch (bad_typeid)
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{
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cout << "Object is NULL" << endl;
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}
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}
What is the output of this program?
1.
#include
2.
#include
3.
#include
4.
using namespace std;
5.
class base
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{
7.
virtual void f(){}
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};
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class derived : public base {};
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int main ()
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{
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try
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{
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base* a = new base;
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base* b = new derived;
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cout << typeid(*a).name() << 't';
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cout << typeid(*b).name();
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}
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catch (exception& e)
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{
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cout << "Exception: " << e.what() << endl;
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}
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return 0;
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}