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Using a switch Statement
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A switch statement selects one of a set of code statements to execute by comparing a value to a set of constants. Listing 4-5 contains an example of a switch statement. Listing 4-5. Using a switch Statement string myName = "Adam Freeman"; switch (myName) { case "Joe Smith":
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Console.WriteLine("Name is Joe Smith"); break; case "Adam Freeman": Console.WriteLine("Name is Adam Freeman"); break; default: Console.WriteLine("Default reached"); break; } In this example, the string variable myName is used as the input value for comparison in the switch statement. Figure 4-16 illustrates the switch statement in Listing 4-5.
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Figure 4-16. The anatomy of a switch statement The switch statement contains one or more case labels, which contain the constant values that myName will be compared against. If the value of myName matches the constant value, then the statements in the switch sections between the case label and the break statement will be performed. If none of the constant values in the case labels matches the input value, then the code statements following the default label are performed. The default section is optional in case statements. Every switch section in a switch statement must end with a break or goto case statement C# does not support falling through from one section to another. You can put multiple case statements next to each other so that the statements in a switch section will be performed if the input value matches one of a set of constant values, like this: switch (myName) { case "Joe Smith": Console.WriteLine("Name is Joe Smith"); break; case "Adam Freeman":
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case "Jane Jones": case "Peter Kent": Console.WriteLine("Name is Adam Freeman, Jane Jones or Peter Kent"); break; default: Console.WriteLine("Default reached"); break; } In this switch statement, a single switch section will be selected if the input value matches any one of three different names. The values specified in the case labels must be constant. Unlike an if statement, you can t use expressions. You can use string and character literal values (see 16), as in Listing 4-5; numeric and bool literal values (see 5); or enum values (see 12).
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Jumping to Another switch Section
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You can combine the statements in switch sections by using a goto case statement, which jumps to the specified section, as follows: switch (myName) { case "Joe Smith": Console.WriteLine("Name is Joe Smith"); break; case "Adam Freeman": Console.WriteLine("Name is Adam Freeman, Jane Jones or Peter Kent"); goto case "Joe Smith"; default: Console.WriteLine("Default reached"); break; } In this switch statement, if the input value is Adam Freeman, the statement in the Adam Freeman switch section is performed, followed by the statement in the Joe Smith section.
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Iterating Data Items
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One of the most common programming tasks is to perform the same series of actions for each element in a sequence of data items for example, items in an array (see 13) or a collection (see 19). C# supports four ways of performing iterations.
Using a for Loop
A for loop repeatedly performs a block of statements while a condition remains true. Before the first iteration, an initializer executes one or more expressions. At the end of each iteration, an iterator executes one or more statements. Another iteration will be performed if the condition evaluates to true. Listing 4-6 contains an example of using a for loop.
CHAPTER 4 C# FUNDAMENTALS AND KEYWORD REFERENCE
Listing 4-6. Using a for Loop using System; class Listing 06 { static void Main(string[] args) { for (int i = 0; i < 5; i++) { Console.WriteLine("Iteration for value: {0}", i); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } Figure 4-17 illustrates the for loop in Listing 4-6.
Figure 4-17. The anatomy of a for loop The initializer, the condition, and the iterator are separated by semicolons (;). The for loop shown in Listing 4-6 is the most common kind the initializer is used to create a local variable for use in the loop conventionally called i. The iterator increments the local loop variable after each repetition, and the condition evaluates to true as long as the value of i is less than a predefined limit, in this case 5. This loop will iterate five times, as we can see if we compile and run the code in Listing 4-6, which produces the following results: Iteration for value: 0 Iteration for value: 1 Iteration for value: 2 Iteration for value: 3 Iteration for value: 4 Press enter to finish Within the loop, I can refer to the local variable i and get the current value. The initializer can define either a local variable or a series of statements separated by commas that should be performed before
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