C++ Usage and Examples of List empty()

C++ List (List)

C ++ The List empty() function checks if the list is empty. If the list is empty, it returns true; otherwise, it returns false. It does not modify the content of the list.

Syntax

bool empty();

Parameters

It does not contain any parameters.

Return value

It returns a boolean value1or 0. If the list is empty, it returns1otherwise returns 0.

Example1

Let's look at a simple example when the list is empty.

Example

#include <iostream>
#include<list>
using namespace std;
int main()
{
　　　　list<int> li;
　　　　std::cout << "empty() : " << li.empty() << std::endl;
　　　　return 0;
}

Output:

empty() :　1

In this example, the return value of the empty() function is1because the list 'li' is empty.

Example2

Let's see a simple example when the list is not empty.

Example

#include <iostream>
#include<list>
using namespace std;
int main()
{
　　　　　list<int> li={1,2,3};
　　　　std::cout << "empty() : " << li.empty() << std::endl;
　　　　return 0;
}

Output:

empty() : 0

In this example, since the list is not empty, the empty() function returns the value '0'.

C++ List (List)