Switch Statements

• Comparisons against a constant value.

Basic Usage

int quarter = 3;

switch (quarter)
{
    case 1:
        Console.WriteLine("Q1");
        break;
    case 2:
        Console.WriteLine("Q2");
        break;
    case 3:
        Console.WriteLine("Q3");
        break;
    case 4:
        Console.WriteLine("Q4");
        break;
    default:
        Console.WriteLine("Invalid Quarter");
        break;
}

Usage with enums

• Enums are a great candidate for switch statements.

enum Months
{
    January = 1,
    February,
    March,
    April,
    May,
    June,
    July,
    August,
    September,
    October,
    November,
    December
}

• Switch will keep executing each line of code until it finds a break.

Months currentMonth = (Months)DateTime.Now.Month;

switch (currentMonth)
{
    case Months.January:
    case Months.March:
    case Months.May:
    case Months.July:
    case Months.August:
    case Months.October:
    case Months.December:
        Console.WriteLine("{0} has 31 days", currentMonth);
        break;
    case Months.April:
    case Months.June:
    case Months.September:
    case Months.November:
        Console.WriteLine("{0} has 30 days", currentMonth);
        break;
    case Months.February:
        Console.WriteLine("{0} has 28 or 29 days", currentMonth);
        break;
}