C++ Programming Questions and Answers – STL Container Any – 2

This set of C++ Programming Questions & Answers for Exams focuses on “STL Container Any – 2”.

1. Which exception is thrown if the typecasting is not done properly?
a) bad_type_cast
b) bad_any_cast
c) type_mismatched
d) bad_cast_mismatched
View Answer

2. What is the use of emplace() function?
a) Used to change the object any container is holding
b) Used to add more item to the any list
c) Used to empty any container value
d) Used to check the type of any variable
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3. What will be the output of the following C++ code?

#include<iostream>
#include<any>
using namespace std;
int main()
{
	float val = 5.5;
	any var(val);
	cout<<var<<endl;
	char c = 'a';
	var.emplace<char>(c);
	cout<<var<<endl;
	return 0;
}

a) 5.5
b) a
c)

5.5
a

d) Error
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4. What is the use of type() function in any container?
a) Used to destroys the contained object in any variable
b) Used to change the object any container is holding
c) Used to return the type information about the any container
d) Used to check whether a container is empty or not
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5. What will be the output of the following C++ code?

#include<iostream>
#include<any>
using namespace std;
int main()
{
	float val = 5.5;
	any var(val);
	cout<<var.type().name()<<endl;
	return 0;
}

a) f
b) d
c) Pkc
d) u
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6. What is the use of has_value() function in any container?
a) Used to destroys the contained object in any variable
b) Used to change the object any container is holding
c) Used to return the type information about the any container
d) Used to check whether any container is empty or not
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7. What will be the output of the following C++ code?

#include<iostream>
#include<any>
using namespace std;
int main()
{
	float val = 5.5;
	any var(val);
	if(var.has_value())
        {
            cout<<"Var is not Empty\n";
        }
        else
        {
            cout<<"Var is Empty\n";
        }
	return 0;
}

a) Var is Empty
b) Var is not Empty
c) Error
d) Segmentation fault
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8. What is the use of reset() function?
a) Used to destroys the contained object in any variable
b) Used to change the object any container is holding
c) Used to empty any container value
d) Used to check the type of any variable
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9. What will be the output of the following C++ code?

#include<iostream>
#include<any>
using namespace std;
int main()
{
	float val = 5.5;
	any var(val);
    cout<<any_cast<float>(var)<<endl;
	var.reset();
	if(!var.has_value())
        {
		cout<<"var is empty\n";
	}
	else{
		cout<<"var is not empty\n";	
	}
	return 0;
}

a) var is empty
b)

5.5
var is not empty

c) 5.5
d)

5.5
var is empty

10. In how many ways we can handle errors in any class?
a) 1
b) 2
c) 3
d) 4
View Answer

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