Which constructor will initialize the base class data member?
Which operator is used to declare the destructor?
What is the output of this program?
1.
#include
2.
using namespace std;
3.
class X
4.
{
5.
int m;
6.
public:
7.
X() : m(10)
8.
{
9.
}
10.
X(int mm): m(mm)
11.
{
12.
}
13.
int getm()
14.
{
15.
return m;
16.
}
17.
};
18.
class Y : public X
19.
{
20.
int n;
21.
public:
22.
Y(int nn) : n(nn) {}
23.
int getn() { return n; }
24.
};
25.
int main()
26.
{
27.
Y yobj( 100 );
28.
cout << yobj.getm() << " " << yobj.getn() << endl;
29.
}
What is the output of this program?
1.
#include
2.
using namespace std;
3.
class Parent
4.
{
5.
public:
6.
Parent (void)
7.
{
8.
cout << "Parent()\n";
9.
}
10.
Parent (int i)
11.
{
12.
cout << "Parent("<< i << ")\n";
13.
};
14.
Parent (void)
15.
{
16.
cout << "~Parent()\n";
17.
};
18.
};
19.
class Child1 : public Parent { };
20.
class Child2 : public Parent
21.
{
22.
public:
23.
Child2 (void)
24.
{
25.
cout << "Child2()\n";
26.
}
27.
Child2 (int i) : Parent (i)
28.
{
29.
cout << "Child2(" << i << ")\n";
30.
}
31.
~Child2 (void)
32.
{
33.
cout << "~Child2()\n";
34.
}
35.
};
36.
int main (void)
37.
{
38.
Child1 a;
39.
Child2 b;
40.
Child2 c(42);
41.
return 0;
42.
}
a) Parent()
Parent()
Child2()
Parent(42)
Child2(42)
~Child2()
~Parent()
~Child2()
~Parent()
~Parent()
b) error
c) runtime error
d) None of the mentioned
What is the output of this program?
1.
#include
2.
using namespace std;
3.
class Base
4.
{
5.
public:
6.
int m;
7.
Base(int n=0)
8.
: m(n)
9.
{
10.
cout << "Base" << endl;
11.
}
12.
};
13.
class Derived: public Base
14.
{
15.
public:
16.
double d;
17.
Derived(double de = 0.0)
18.
: d(de)
19.
{
20.
cout << "Derived" << endl;
21.
}
22.
};
23.
int main()
24.
{
25.
cout << "Instantiating Base" << endl;
26.
Base cBase;
27.
cout << "Instantiating Derived" << endl;
28.
Derived cDerived;
29.
return 0;
30.
}
a) Instantiating Base
Base
Instantiating Derived
Base
Derived
b) Instantiating Base
Instantiating Derived
Base
Derived
c) Instantiating Base
Base
Instantiating Derived
Base
d) None of the mentioned