by Sai gowtham

Checking if a string is empty in C++

In this tutorial, we are going to learn about how to check if a string is empty or not in C++.

Checking string is empty

To check if a string is empty or not, we can use the built-in empty() function in C++.

The empty() function returns 1 if string is empty or it returns 0 if string is not empty.

Here is an example:

#include <iostream>
#include <string.h>
using namespace std;

int main()
{
   string user = "";
    if(user.empty()){
        cout << "user string is empty";
    }else{
        cout << "user string is not empty ";
    }

    return 0;
}

Output:

"user string is empty"

Similarly, we can also use the length() function to check if a given string is empty or not.

#include <iostream>
#include <string.h>
using namespace std;

int main()
{
   string user = "";
    if(user.length() === 0){
        cout << "user string is empty";
    }else{
        cout << "user string is not empty ";
    }

    return 0;
}

or we can use the size() function.

#include <iostream>
#include <string.h>
using namespace std;

int main()
{
   string user = "";
    if(user.size() === 0){
        cout << "user string is empty";
    }else{
        cout << "user string is not empty ";
    }

    return 0;
}

Note: The length() or size() functions returns the total number of characters in a given string.

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