String Concatenation

• Our printed question is running up against the space where the user types their answer.
• We need to add a space onto the end of the user question.
• We can do this by taking the question string, and concatenating, or joining, a string consisting of a single space onto the end of it.

// We can concatenate strings.
Console.WriteLine("a" + "b");
Console.WriteLine("some words" + "more words");
// If we want a space between the joined strings, we need
// to add it ourselves.
Console.WriteLine("some words" + " " + "more words");

// We can concatenate strings stored in variables.
string myString = "a string";
Console.WriteLine(myString + " abc");
// Notice that simply concatenating onto a string stored
// in a variable doesn't change the value in the variable.
Console.WriteLine(myString);
// To update the variable, we need to assign the concatenated
// value back to it.
myString += " abc";
Console.WriteLine(myString);
myString += " def";
Console.WriteLine(myString);

• Using string concatenation to fix our ask method:

    static string Ask(string question)
    {
        Console.Write(question + " ");
        return Console.ReadLine();
    }

• Let's print what the user entered so they can confirm it's correct.

    static void Main()
    {
        Console.WriteLine("Welcome to the cat food store!");

        string entry = Ask("How many cans are you ordering?");
        Console.WriteLine("You entered" + entry + "cans");
    }

You entered11cans

• Oops! We need to add spaces surrounding answer, so fix that:

    static void Main()
    {
        Console.WriteLine("Welcome to the cat food store!");

        string entry = Ask("How many cans are you ordering?");
        Console.WriteLine("You entered " + entry + " cans");
    }

You entered 11 cans