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C++ miscellaneous MCQ question and answer with solution | C++ Programimg MCQs

Learn C++ miscellaneous MCQ Questions and answers with easy and logical explanations in C++ Programimg. C++ miscellaneous MCQ question provides all type of technical mcq questions which is important for technical exams, campus exams and other entrance examination. Page-5 section-1

Each section contains 100 MCQs on C plus plus miscellaneous .
41
Which header file is used for generating random numbers?
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Answer & Solution
Answer: Option D
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42
What will be the output of the following C++ code?
#include<iostream>
using namespace std;
class X 
{
    int m;
    public:
    X() : m(10)
    {                                                       
    }
    X(int mm): m(mm)
    {
    }
    int getm()
    {
        return m;
    }
};
class Y : public X 
{
    int n;
    public:
    Y(int nn) : n(nn) {}                                                
    int getn() { return n; }
};
int main()
{
    Y yobj( 100 );
    cout << yobj.getm() << " " << yobj.getn() << endl;
}
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Answer & Solution
Answer: Option A
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43
What will be the output of the following C++ code?
#include <iostream>
#include <bitset>
using namespace std;
int main()
{
	bitset<8> b1(95);
	bitset<8> b2(45);
	cout<<~b1<<endl;
	cout<<(b1|b2)<<endl;
	cout<<(b1&b2)<<endl;
}
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Answer & Solution
Answer: Option A
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44
Which function is used to check whether a character is a number?
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Answer & Solution
Answer: Option C
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45
How many kinds of parameters are there in C++?
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Answer & Solution
Answer: Option C
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46
What will be the output of the following C++ code?
#include <iostream>
#include <functional>
#include <numeric>
using namespace std;
int myfunction (int x, int y) 
{
    return x + 2 * y;
}
struct myclass 
{
    int operator()(int x, int y) 
    {
        return x + 3 * y;
    }
} myobject;
int main () 
{
    int init = 100;
    int numbers[] = {10, 20, 30};
    cout << accumulate(numbers, numbers + 3, init);
    cout << endl;
}
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Answer & Solution
Answer: Option C
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47
Which is used to get the input during runtime?
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Answer & Solution
Answer: Option B
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48
What is meant by pure virtual function?
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Answer & Solution
Answer: Option A
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49
What will be the output of the following C++ code?
#include <iostream>
#include <complex>
using namespace std;
int main()
{
	complex <double> cn(3.0, 5.0);
	cout<<"Complex number is: "<<real(cn)<<" + "<<imag(cn)<<"i"<<endl;
	return 0;
}
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Answer & Solution
Answer: Option A
Solution:
In the given C++ code, the complex class from the C++ Standard Library is used to represent a complex number.

In the statement complex cn(3.0, 5.0), the constructor initializes the real part as 3.0 and the imaginary part as 5.0.

The function real(cn) returns the real part of the complex number, which is 3.

The function imag(cn) returns the imaginary part, which is 5.

Hence, the output will be: Complex number is: 3 + 5i.
50
What will be the output of the following C++ code?
#include <iostream>
using namespace std;
class poly
{
    protected:
    int width, height;
    public:
    void set_values(int a, int b)
    {
        width = a; height = b;
    }
};
class Coutput
{
    public:
    void output(int i);
};
void Coutput::output(int i)
{
    cout << i;
}
class rect:public poly, public Coutput
{
    public:
    int area()
    {
        return(width * height);
    }
};
class tri:public poly, public Coutput
{
    public:
    int area()
    {
        return(width * height / 2);
    }
};
int main()
{
    rect rect;
    tri trgl;
    rect.set_values(3, 4);
    trgl.set_values(4, 5);
    rect.output(rect.area());
    trgl.output(trgl.area());
    return 0;
}
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Answer & Solution
Answer: Option B
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