Advanced C++ Test – 1

1. What will be the output of the following C++ code?

#include<iostream>
using namespace std;
int main()
{
	int a = 5;
	auto check = [&]() 
        {
		a = 10;
	};
	check();
	cout<<"Value of a: "<<a<<endl;
	return 0;
}

2. What is the syntax of defining lambda expression?

3. What is lambda expression in C++?

4. Which is the correct syntax of capturing a variable 'X' by reference and other variable 'Y' by value in lambda expression?

5. What is the correct statement about lambda expression?

6. Which of the following operator is used to capture all the external variable by value?

7. What will be the output of the following C++ code?

#include<iostream>
using namespace std;
int main()
{
	int a = 5;
	auto check = [](int x) 
        {
		if(x == 0)
			return false;
		else
			return true;
	};
	cout<<check(a)<<endl;
	return 0;
}

8. Which of the following operator is used to capture all the external variable by reference?

9. What will be the output of the following C++ code?

#include<iostream>
using namespace std;
int main()
{
	int a = 5;
	int b = 5;
	auto check = [&a]() 
        {
		a = 10;
		b = 10;
	}
	check();
	cout<<"Value of a: "<<a<<endl;
	cout<<"Value of b: "<<b<<endl;
	return 0;
}

10. What will be the output of the following C++ code?

#include<iostream>
using namespace std;
int main()
{
	int a = 5;
	auto check = [=]() 
        {
		a = 10;
	};
	check();
	cout<<"Value of a: "<<a<<endl;
	return 0;
}

11. In how many ways we can capture the external variables in the lambda expression?

12. 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;
}