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C# 30: A Beginner s Guide
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5 To retrieve elements, use the Get( ) method, shown next: // Get a character from the queue public char Get() { if(getloc == putloc) { ConsoleWriteLine(" -- Queue is empty"); return (char) 0; } getloc++; return q[getloc]; }
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Notice first the check for queue-empty If getloc and putloc both index the same element, the queue is assumed to be empty This is why getloc and putloc were both initialized to zero by the SimpleQueue constructor Next, getloc is incremented and the next element is returned Thus, getloc always indicates the location of the last element retrieved
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6 Here is the entire QDemocs program: // A simple queue class for characters using System; class SimpleQueue { public char[] q; // this array holds the queue public int putloc, getloc; // the put and get indices public SimpleQueue(int size) { q = new char[size+1]; // allocate memory for queue putloc = getloc = 0; } // Put a character into the queue public void Put(char ch) { if(putloc==qLength-1) { ConsoleWriteLine(" -- Queue is full"); return; } putloc++; q[putloc] = ch; } // Get a character from the queue public char Get() { if(getloc == putloc) { ConsoleWriteLine(" -- Queue is empty"); return (char) 0; }
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5: More Data Types and Operators
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getloc++; return q[getloc]; } } // Demonstrate the SimpleQueue class class QDemo { static void Main() { SimpleQueue bigQ = new SimpleQueue(100); SimpleQueue smallQ = new SimpleQueue(4); char ch; int i; ConsoleWriteLine("Using bigQ to store the alphabet"); // put some numbers into bigQ for(i=0; i < 26; i++) bigQPut((char) ('A' + i)); // Retrieve and display elements from bigQ ConsoleWrite("Contents of bigQ: "); for(i=0; i < 26; i++) { ch = bigQGet(); if(ch != (char) 0) ConsoleWrite(ch); } ConsoleWriteLine("\n"); ConsoleWriteLine("Using smallQ to generate errors"); // Now, use smallQ to generate some errors for(i=0; i < 5; i++) { ConsoleWrite("Attempting to store " + (char) ('Z' - i)); smallQPut((char) ('Z' - i)); ConsoleWriteLine(); } ConsoleWriteLine(); // More errors on smallQ ConsoleWrite("Contents of smallQ: "); for(i=0; i < 5; i++) { ch = smallQGet(); if(ch != (char) 0) ConsoleWrite(ch); } } }
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C# 30: A Beginner s Guide
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7 The output produced by the program is shown here: Using bigQ to store the alphabet Contents of bigQ: ABCDEFGHIJKLMNOPQRSTUVWXYZ Using smallQ to generate errors Attempting to store Z Attempting to store Y Attempting to store X Attempting to store W Attempting to store V -- Queue is full Contents of smallQ: ZYXW -- Queue is empty 8 On your own, try modifying SimpleQueue so that it stores other types of objects For
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example, have it store ints or doubles
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The foreach Loop
In 3, it was mentioned that C# defines a loop called foreach, but a discussion of that statement was deferred until you knew more about C# The time for that discussion has come The foreach loop is used to cycle through the elements of a collection A collection is a group of objects C# defines several types of collections, of which one is an array The general form of foreach is shown here: foreach(type loopvar in collection) statement; Here, type loopvar specifies the type and name of an iteration variable The iteration variable receives the value of the next element in the collection each time the foreach loop iterates The collection being cycled through is specified by collection, which, for the rest of this discussion, is an array Thus, type must be the same as (or compatible with) the element type of the array Beginning with C# 30, type can also be var, in which case the compiler determines the type based on the element type of the array This can be useful when working with certain queries, as described later in this book Normally, you will explicitly specify the type Here is how the foreach works When the loop begins, the first element in the array is obtained and assigned to loopvar Each subsequent iteration obtains the next element from the array and stores it in loopvar The loop ends when there are no more elements to obtain Thus, the foreach cycles through the array one element at a time, from start to finish One important point to remember about foreach is that the iteration variable loopvar is read-only This means that you can t change the contents of an array by assigning the iteration variable a new value Here is a simple example that uses foreach It creates an array of integers and gives it some initial values It then uses a foreach loop to display those values, computing the summation in the process
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