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

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71.
What will be the output of the following C++ code?
#include<iostream>
using namespace std;
int main()
{
    int x = 5;
    auto check = []() -> bool 
    {
	if(x == 0)
		return false;
	else
		return true;
    };
    cout<<check()<<endl;
    return 0;
}

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73.
What will be the output of the following C++ code?
#include <iostream> 
#include <vector> 
 
using namespace std; 
 
int main() 
{ 
    vector<int> v; 
 
    for (int i = 1; i <= 5; i++) 
        v.push_back(i); 
 
    vector<int> :: const_iterator i;
    i = v.begin();
    *i = 3;
   	for (i = v.begin(); i != v.end(); ++i) 
        cout << *i << " ";
    cout<<endl;
 
    return 0; 
}

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75.
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<<"Absolute value is: "<<abs(cn)<<endl;
	return 0;
}

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76.
What will be the output of the following C++ code?
#include <iostream>
#include <typeinfo>
#include <exception>
using namespace std;
class base 
{ 
    virtual void f(){} 
};
class derived : public base {};
int main () 
{
    try 
    {
        base* a = new base;
        base* b = new derived;
        cout << typeid(*a).name() <v '\t';
        cout << typeid(*b).name();
    } 
    catch (exception& e) 
    { 
        cout << "Exception: " << e.what() << endl; 
    }
    return 0;
}

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77.
What will be the output of the following C++ code?
#include <iostream>
#include <string>
using namespace std;
class A
{
	int a;
    public:
	virtual void func() = 0;
};
 
class B: public A
{
   public:
	void func(){
		cout<<"Class B"<<endl;
	}	
};
 
int main(int argc, char const *argv[])
{
	B b;
	b.func();
	return 0;
}

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78.
What will be the output of the following C++ code?
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
int main () 
{
    int myints[] = {1, 2, 3, 4 ,5};
    vector<int> v(myints, myints + 5);
    v.push_back(33); 
    push_heap (v.begin(),v.end());
    cout << v.front() << '\n';
    sort_heap (v.begin(),v.end());
    return 0;
}

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