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Questions

Questions

  • Open Visual Studio and create a new project for the Hello World application

  • Enter the source code from the "Hello World" example:

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    using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace HelloWorld
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello, World!);
            Console.ReadKey();
        }
    }
}

  • Compile and run

  • Enhance the program to store your name in two variables, one for your first name and the other your last name
  • Print your name to the screen using these variables using each of the approaches suggested above. Compile and run your program

  • Study the following program, and answer the questions below:

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    using System;

namespace volume
{
    class Program
    {
        static void Main(string[] args)
        {
            int length;
            int height;
            int width;
            int volume;

            Console.Clear();
            Console.Write("Enter length >");
            length = Convert.ToInt32(Console.ReadLine());
            Console.Write("Enter height > ");
            height = Convert.ToInt32(Console.ReadLine());
            Console.Write("Enter width > ");
            width = Convert.ToInt32(Console.ReadLine());

            volume = length * height * width;

            Console.WriteLine($"The volume of the box ({length}x{width}x{height}) is {volume}");
            Console.WriteLine("Press any key to quit ...");
            Console.ReadKey();
        }
    }
}
    • What does the program do?
    • What does Console.ReadLine() do?
    • The variables, length, width etc are preceded by the keyword int. What is the purpose of int in this context?
    • Convert.ToInt32 is easy to read as "Convert to a 32 bit integer", but why is this necessary here?
    • What is the meaning of = in this context?
    • The "Hello World" program used Console.WriteLine(), this program uses Console.Write(). What is the difference between them?

Create a new project for the program in question 5, enter the code, compile and run. Add a title to print to the screen and add comments to identify the following features of the source code:

  • program header
  • statement to include a C# namespace (library)
  • variable declarations
  • output statement
  • input statement
  • assignment statement

Additional Exercises

  1. Install Visual Studio Community Edition on a home computer
  2. Create a directory on your computer for your programming projects
  3. Set up a GitHub account
  4. Write a program to calculate the area of a triangle. (The formula is \(\frac{height \times base}{2}\))
  5. Follow the Microsoft "numbers in C#" tutorial