MCQs
Because it is having the proper data set to initialize, Otherwise it will throw a error.
What is the output of this program?
1.
#include
2.
using namespace std;
3.
class X
4.
{
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int m;
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public:
7.
X() : m(10)
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{
9.
}
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X(int mm): m(mm)
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{
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}
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int getm()
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{
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return m;
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}
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};
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class Y : public X
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{
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int n;
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public:
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Y(int nn) : n(nn) {}
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int getn() { return n; }
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};
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int main()
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{
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Y yobj( 100 );
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cout
In this program, We are passing the value and getting the result by derived class.
Output:
$ g++ der5.cpp
$ a.out
10 100
None.
Answer:b
Explanation:In this program, We got an error in overloading because we didnt invoke the
destructor of parent.
Answer:a
Explanation: In this program, We are printing the execution order of the program.
Output:
$ g++ der2.cpp
$ a.out
Instantiating Base
Base
Instantiating Derived
Base
Derived
None.
In this program, We are passing the value and manipulating by using the derived class.
Output:
$ g++ der.cpp
$ a.out
54.3R
What is the output of this program?
1.
#include
2.
using namespace std;
3.
class BaseClass
4.
{
5.
protected:
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int i;
7.
public:
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BaseClass(int x)
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{
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i = x;
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}
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~BaseClass()
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{
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}
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};
16.
class DerivedClass: public BaseClass
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{
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int j;
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public:
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DerivedClass(int x, int y): BaseClass(y)
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{
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j = x;
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}
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~DerivedClass()
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{
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}
27.
void show()
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{
29.
cout
In this program, We are passing the values and assigning it to i and j and we are printing it.
Output:
$ g++ der1.cpp
$ a.out
4 3
Because derived inherits functions and variables from base.
Destructors are automatically invoked when a object goes out of scope or when a dynamically
allocated object is deleted. Inheritance does not change this behavior. This is the reason a
derived destructor cannot invoke its base class destructor.