How to check if a List is Not Empty in C++ - Step by Step Examples

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How to check if a List is Not Empty in C++ ?

Answer

To check if a list is not empty in C++, you can use the empty() method of the std::list class.

✐ Examples

1 Check if a List with Elements is Not Empty

In this example,

We include the necessary headers and use the std namespace.
We create a list named myList with some elements.
We use an if statement to check if myList is not empty by calling the empty() method.
If the list is not empty, the code inside the if block is executed.
We print a message indicating that the list is not empty.

C++ Program

#include <iostream>
#include <list>

int main() {
    std::list<int> myList = {1, 2, 3};
    
    if (!myList.empty()) {
        std::cout << "The list is not empty" << std::endl;
    } else {
        std::cout << "The list is empty" << std::endl;
    }
    
    return 0;
}

Output

The list is not empty

2 Check if an Empty List is Not Empty

In this example,

We include the necessary headers and use the std namespace.
We create a list named emptyList without any elements.
We use an if statement to check if emptyList is not empty by calling the empty() method.
Since the list is empty, the code inside the else block is executed.
We print a message indicating that the list is empty.

C++ Program

#include <iostream>
#include <list>

int main() {
    std::list<int> emptyList;
    
    if (!emptyList.empty()) {
        std::cout << "The list is not empty" << std::endl;
    } else {
        std::cout << "The list is empty" << std::endl;
    }
    
    return 0;
}

Output

The list is empty

Summary

In this tutorial, we learned How to check if a List is Not Empty in C++ language with well detailed examples.

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How to check if a List is Not Empty in C++ - Step by Step Examples

How to check if a List is Not Empty in C++ ?

Answer

✐ Examples

1 Check if a List with Elements is Not Empty

C++ Program

Output

2 Check if an Empty List is Not Empty

C++ Program

Output

Summary

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