create vector of specific size c++

To create a vector of a specific size in C++, you can follow the steps below:

  1. Include the vector header file: Begin by including the vector header file at the beginning of your code. This can be done using the "#include" directive.
#include <vector>
  1. Declare and initialize the vector: Next, declare a vector variable of the desired type and specify its size using the constructor. The constructor takes two arguments: the size of the vector and the initial value to be assigned to each element.
std::vector<int> myVector(5); // Creates a vector of size 5 with default-initialized elements
  1. Access and modify elements: You can access individual elements of the vector using the square bracket notation. Elements are indexed starting from 0. To assign a new value to an element, use the assignment operator.
myVector[0] = 10; // Assigns 10 to the first element
  1. Iterate over the vector: To access all the elements in the vector, you can use a loop. The range-based for loop is a convenient way to iterate over the elements.
for (int i : myVector) {
    // Do something with each element
}
  1. Resize the vector: If you want to change the size of the vector after its creation, you can use the resize() function. It takes the new size as an argument and adds or removes elements accordingly.
myVector.resize(10); // Resizes the vector to have 10 elements

That's it! You now have a vector of a specific size in C++. Remember to include the necessary header file, declare the vector with the desired size, and utilize the available functions to access, modify, and resize the vector as needed.