Building the project in the VB.NET console

This simple console application written in VB.NET programming language performs basic arithmetic operations on two input numbers.

The program first imports the System namespace. Then, it defines a module called program, which contains a single Sub called Main that takes an array of String arguments.

Within the Main method, the program declares five variables: n1, n2, oper of type String, a res of type String initialized to an empty string, and a sentinel of type String initialized to False.

The program enters a Do-While loop until the sentinel is set to True. Within the loop, the program prompts the user to enter the first number or X to quit. If the user enters X, the sentinel variable is set to True, and the loop ends. Otherwise, the program prompts the user to enter the second number and the arithmetic operator.

The program then uses a Select Case statement to perform the appropriate arithmetic operation based on the user’...