C++ STL Test - 3 - Sanfoundry

1. Which exception is thrown if the typecasting is not done properly?

type_mismatched

bad_cast_mismatched

bad_type_cast

bad_any_cast

2. What is the use of type() function in any container?

Used to destroys the contained object in any variable

Used to check whether a container is empty or not

Used to return the type information about the any container

Used to change the object any container is holding

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.type().name()<<endl;
	return 0;
}

Pkc

4. What is the use of has_value() function in any container?

Used to destroys the contained object in any variable

Used to change the object any container is holding

Used to check whether any container is empty or not

Used to return the type information about the any container

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<<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;
}

5.5
var is not empty

5.5
var is empty

var is empty

5.5

6. What is the use of reset() function?

Used to change the object any container is holding

Used to check the type of any variable

Used to destroys the contained object in any variable

Used to empty any container value

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;
}

Var is Empty

Var is not Empty

Error

Segmentation fault

8. What is the use of emplace() function?

Used to empty any container value

Used to change the object any container is holding

Used to check the type of any variable

Used to add more item to the any list

9. In how many ways we can handle errors in any class?

10. 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;
}

5.5

Error

5.5
a