How can you initialize all elements of an array to a specific value in $C++?$

Given an array of integers, describe the time complexity of searching for a specific value in the following scenarios: The array is sorted in ascending order.

The array is unsorted.

What is the difference between the size of an array and its index range?

Describe common operations performed on multidimensional arrays in $C++.$

What are the advantages and disadvantages of using arrays compared to vectors $($std::vector$)$ in C$++?$

Describe the different scopes $($local$,$ block, file, and function$)$ within which variables and functions can be accessed in C$++$ programs. How does scope affect the visibility of identifiers?

Write a C$++$ program that prompts the user to enter a number between $1$ and $12.$ The program should then use a switch statement to determine and display the corresponding day of the week $($e$.$g$.,$ "January" for $1,$ "February" for $2,$ and so on$).$ Include a default case to handle invalid input.