Exercises

To get started, open up Visual Studio and create a new console program.

Tip

If you do not recall how to create a new console program or need a quick refresher to get started, check out the section on creating a C# project .

For each part of the exercises, create a new project in your solution. When you are done, push your solution up to a repository on your Github account!

Input/Output

  1. Write a new “Hello, World” program to prompt the user for their name and greet them by name.

    a. Add a question to ask the user:

       Console.WriteLine("What is your name?");

    b. Create a variable to store the user’s input:

       string name = Console.ReadLine();

    c. Use concatenation to print the greeting:

       Console.WriteLine("Hello " + name);

    d. Run your program.

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       Console.WriteLine("What is your name?");
   string myName = Console.ReadLine();
   Console.WriteLine("Hello " + myName + "!");

Numeric Types

  1. Write a program to calculate the area of a rectangle and print the answer to the console. You should prompt the user for the dimensions. (What data types should the dimensions be?)

    a. Add a print line to prompt the user for the length of the rectangle.

       Console.WriteLine("What is the length of your rectangle?");

    b. Define a variable to handle the user’s response.

    c. Repeat the previous two steps to ask for and store the rectangle’s width.

       Console.WriteLine("What is the width of your rectangle?");
   string width = Console.ReadLine();

    d. Use the length and width values to calculate the rectangle’s area.

    e. Print a statement using concatenation to communicate to the user what the area of their rectangle is.

       Console.WriteLine("The area of the rectangle is: " + area);

    f. Run the program to verify your code.

More on Numeric Types

  1. Write a program that asks a user for the number of miles they have driven and the amount of gas they’ve consumed (in gallons), and print their miles-per-gallon.

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       Console.WriteLine("How many miles did you drive on your trip?");
   string mi = Console.ReadLine();
   int miles = Int32.Parse(mi);

   Console.WriteLine("How many gallons of gas did you use?");
   string gal = Console.ReadLine();
   int gallons = Int32.Parse(gal);

   int mpg = miles / gallons;
   Console.WriteLine("The MPG for the trip was: " + mpg);

Strings

  1. The first sentence of Alice’s Adventures in Wonderland is below. Store this sentence in a string, and then prompt the user for a term to search for within this string. Print whether or not the search term was found. Make the search case-insensitive, so that searching for “alice”, for example, prints true.

    Alice was beginning to get very tired of sitting by her sister on the
bank, and of having nothing to do: once or twice she had peeped into the
book her sister was reading, but it had no pictures or conversations in
it, 'and what is the use of a book,' thought Alice 'without pictures or
conversation?'
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       string alice = @"Alice was beginning to get very tired of sitting by her sister on the
   bank, and of having nothing to do: once or twice she had peeped into the
   book her sister was reading, but it had no pictures or conversations in
   it, 'and what is the use of a book,' thought Alice 'without pictures or
   conversation?'";
   
   Console.WriteLine(alice);
   Console.WriteLine("What sentence would you like to look for in the sentence above?");
   string searchTerm = Console.ReadLine();
   string compSearchTerm = searchTerm.ToLower();
   string compAlice = alice.ToLower();

   if (compAlice.IndexOf(compSearchTerm, 0) != -1)
   {
      Console.WriteLine("true");
   }
   else 
   {
      Console.WriteLine("false");
   }

  2. Extend the previous exercise. Assume the user enters a word that is in the sentence. Print out its index within the string and its length. Next, remove the word from the string and print the sentence again to confirm your code. Remember that strings are immutable, so you will need to reassign the old sentence variable or create a new one to store the updated phrase.