**`empty()`** is a member function of the `basic_string` class template in the standard template library. It returns a bool that indicates whether or not a string is empty, i.e., it returns true if the string has zero characters in it. 

# Syntax

```
your_string_variable.empty();
```

# Code explanation

The following code demonstrates how the `empty()` member function can be used.  The first string contains a phrase and the second string contains a #key# space: considered as a character #key#. Hence, the output shows $0$ or *False*, indicating that the strings are NOT empty. In contrast, the third string is empty, which is confirmed by the output of $1$ or *True*.

The if-else statements can be used to check if a specific string is empty and print a message accordingly.

# Code



#include <iostream>

int main()
{
    std::string my_string1 = "Happy Learning at Educative!";
    std::string my_string2 = " "; //contains a space
    std::string my_string3 = "";

    std::cout<<"is my_string1 empty? "<<my_string1.empty()<<"\n";
    std::cout<<"is my_string2 empty? "<<my_string2.empty()<<"\n";
    std::cout<<"is my_string3 empty? "<<my_string3.empty()<<"\n";

    if(my_string1.empty())
    {
        std::cout<<"my_string1 is empty! "<<"\n";
    }
    else
    {
        std::cout<<"my_string1 is not empty! "<<"\n";
    }
}

What is basic_string::empty in C/C++?

empty() checks if a basic_string has zero characters, returning true if it does.