How to check if a Vector is Not Empty in C++

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

Answer

To check if a vector is not empty in C++, you can use the empty() member function, which returns false if the vector contains elements.

✐ Examples

1 Check if a Numeric Vector is Not Empty

In this example,

We create a vector named numVec to store numeric values.
We use the empty() member function to check if numVec is not empty.
If !numVec.empty() returns true, it means the vector is not empty.
We print a message indicating whether the vector is not empty or not.

C++ Program

#include <iostream>
#include <vector>

int main() {
    std::vector<int> numVec = {10, 20, 30, 40, 50};
    if (!numVec.empty()) {
        std::cout << "Numeric vector is not empty" << std::endl;
    } else {
        std::cout << "Numeric vector is empty" << std::endl;
    }
    return 0;
}

Output

Numeric vector is not empty

2 Check if a String Vector is Not Empty

In this example,

We create a vector named strVec to store string values.
We use the empty() member function to check if strVec is not empty.
If !strVec.empty() returns true, it means the vector is not empty.
We print a message indicating whether the vector is not empty or not.

C++ Program

#include <iostream>
#include <vector>
#include <string>

int main() {
    std::vector<std::string> strVec = {"apple", "banana", "cherry", "date"};
    if (!strVec.empty()) {
        std::cout << "String vector is not empty" << std::endl;
    } else {
        std::cout << "String vector is empty" << std::endl;
    }
    return 0;
}

Output

String vector is not empty

Summary

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

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How to check if a Vector is Not Empty in C++

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

Answer

✐ Examples

1 Check if a Numeric Vector is Not Empty

C++ Program

Output

2 Check if a String Vector is Not Empty

C++ Program

Output

Summary

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