How to Check if a String is Empty in C++?

In C++, strings are the sequence of characters that are stored as std::string class objects. In this article, we will learn how to check if a string is empty in C++

Example

Input: str1="Hello! Geek" ; str2=""

Output: 
str1 is not empty
str2 is empty

Checking if the String is Empty in C++

To check for an empty string we can use the std::string::empty() function because what the empty function does is it checks for the length of a string and if the string is empty, it returns true, otherwise, it returns false.

C++ Program to Check for Empty String

The below example demonstrates the use of the empty function to check for empty string.

C++

// C++ program to check for empty string

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

int main()
{

    // declaring teo strings
    string str1 = "Hello! Geek";
    string str2 = "";
    // checking if the given string is empty or not
    if (str1.empty()) {
        // string is found empty
        cout << "str1 is empty" << endl;
    }
    else {
        cout << "str1 is not empty" << endl;
    }

    if (str2.empty()) {
        cout << "str2 is empty" << endl;
    }
    else {
        cout << "str2 is not empty" << endl;
    }

    return 0;
}

Output

str1 is not empty
str2 is empty

We can also use compare() and size() functions to check if string is empty.