How to create an Empty Vector in C++ - Step by Step Examples

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How to create an Empty Vector in C++ ?

Answer

To create an empty vector in C++, you can use the std::vector class from the Standard Template Library (STL).

✐ Examples

1 Create an Empty Integer Vector

In this example,

We include the header at the beginning of the program to use the std::vector class.
We use the std::vector declaration to define a vector that will hold integers.
We name our vector empty_vector and initialize it using the default constructor, which creates an empty vector.
We print the size of the vector using the size() member function to confirm that it is empty. The size() function returns the number of elements in the vector.
Finally, we use std::cout to output the size of the vector to the console.

C++ Program

#include <vector>
#include <iostream>

int main() {
    std::vector<int> empty_vector;
    std::cout << "Size of empty vector: " << empty_vector.size() << std::endl;
    return 0;
}

Output

Size of empty vector: 0

2 Create an Empty String Vector

In this example,

We include the header at the beginning of the program to use the std::vector class, and the header to use the std::string class.
We use the std::vector declaration to define a vector that will hold strings.
We name our vector empty_string_vector and initialize it using the default constructor, which creates an empty vector.
We print the size of the vector using the size() member function to confirm that it is empty. The size() function returns the number of elements in the vector.
Finally, we use std::cout to output the size of the vector to the console.

C++ Program

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

int main() {
    std::vector<std::string> empty_string_vector;
    std::cout << "Size of empty string vector: " << empty_string_vector.size() << std::endl;
    return 0;
}

Output

Size of empty string vector: 0

Summary

In this tutorial, we learned How to create an Empty Vector in C++ language with well detailed examples.

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How to create an Empty Vector in C++ - Step by Step Examples

How to create an Empty Vector in C++ ?

Answer

✐ Examples

1 Create an Empty Integer Vector

C++ Program

Output

2 Create an Empty String Vector

C++ Program

Output

Summary

More C++ Vectors Tutorials