what is push() c++

Explanation of the push() function in C++

The push() function is a member function of the C++ Standard Template Library (STL) container classes, such as std::vector, std::stack, and std::queue. It is used to add an element to the end of the container.

Here is an explanation of each step involved in using the push() function:

  1. Create a container object: First, you need to create an object of the container class you want to use, such as std::vector, std::stack, or std::queue. For example, to use push() with a std::vector, you would create a std::vector object.

  2. Access the push() function: Once you have the container object, you can access the push() function using the dot operator (.) or the arrow operator (->) if you have a pointer to the object. The push() function is a member function of the container class.

  3. Pass the element to be added: The push() function takes an argument that represents the element you want to add to the container. The type of the argument depends on the container class. For example, if you are using a std::vector<int>, you would pass an int value to push().

  4. Call the push() function: Finally, you call the push() function on the container object and pass the element you want to add as an argument. The push() function adds the element to the end of the container.

Here is an example of using the push() function with a std::vector:

#include <vector>
#include <iostream>

int main() {
    std::vector<int> numbers; // Step 1: Create a std::vector object

    numbers.push_back(10); // Step 2-4: Call the push() function and pass the element to be added

    std::cout << "Size of vector: " << numbers.size() << std::endl; // Output: Size of vector: 1

    return 0;
}

In this example, we create a std::vector<int> object called numbers. We then call the push_back() function (which is equivalent to push() for std::vector) and pass the value 10 as the argument. The push_back() function adds 10 to the end of the vector. Finally, we print the size of the vector, which is 1 in this case.

Note: The specific syntax and behavior of the push() function may vary depending on the container class you are using. Make sure to refer to the documentation or relevant resources for the specific container class you are working with.

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