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

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

Last Updated : 01 Feb, 2024

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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.

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

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