Exercise Solutions: Data Types

Line numbers are for reference. They may not match your code exactly.

Input/Output

  1. Write a new “Hello, World” program to prompt the user for their name and greet them by name.
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   Console.WriteLine("What is your name?");
   string myName = Console.ReadLine();
   Console.WriteLine("Hello " + myName + "!");

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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?)
  1. Add a print line to prompt the user for the length of the rectangle.
Console.WriteLine("What is the length of your rectangle?");

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  1. 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();

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  1. 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);

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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);

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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");
   }

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