how to initialize vector in c++ with all elements 0

To initialize a vector in C++ with all elements set to 0, you can use the std::vector constructor along with the std::vector's size_type constructor overload. This constructor allows you to create a vector with a specified size and value for each element.

Here is an example of how to initialize a vector with all elements set to 0:

#include <vector>

int main() {
    // Initialize a vector with 5 elements, all set to 0
    std::vector<int> myVector(5, 0);

    return 0;
}

In the example above, we include the <vector> header to use the std::vector class. We then define the main function, which is the entry point of a C++ program.

Inside the main function, we declare a variable myVector of type std::vector<int>. We initialize myVector with a size of 5 and each element set to 0. The 5 specifies the size of the vector, and the 0 is the value that each element will be initialized with.

By using this constructor, all elements in myVector will be set to 0.

Note that the std::vector class is part of the Standard Template Library (STL) in C++. It provides a dynamic array-like container that can resize itself automatically as elements are added or removed. The constructor used in this example is just one of the many ways to initialize a vector in C++.