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As the table shows, C# defines both signed and unsigned versions of the various integer types The difference between signed and unsigned integers is in the way the high-order bit of the integer is interpreted If a signed integer is specified, then the C# compiler will generate code that assumes the high-order bit of an integer is to be used as a sign flag If the sign flag is 0, then the number is positive; if it is 1, then the number is negative Negative numbers are almost always represented using the two s complement approach In this method, all bits in the negative number are reversed, and then 1 is added to this number Signed integers are important for a great many algorithms, but they have only half the absolute magnitude of their unsigned relatives For example, as a short, here is 32,767: 01111111 11111111 For a signed value, if the high-order bit were set to 1, the number would then be interpreted as 1 (assuming the two s complement format) However, if you declared this to be a ushort, then when the high-order bit was set to 1, the number would become 65,535 Probably the most commonly used integer type is int Variables of type int are often employed to control loops, to index arrays, and for general-purpose integer math When you need an integer that has a range greater than int, you have many options If the value you want to store is unsigned, you can use uint For large signed values, use long For large unsigned values, use ulong For example, here is a program that computes the distance from the Earth to the sun, in inches Because this value is so large, the program uses a long variable to hold it

// Compute the distance from the Earth to the sun, in inches using System; class Inches { static void Main() { long inches; long miles; miles = 93000000; // 93,000,000 miles to the sun // 5,280 feet in a mile, 12 inches in a foot inches = miles * 5280 * 12; ConsoleWriteLine("Distance to the sun: " + inches + " inches"); } }

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Note that data, from the Latin datum, can be treated as either singular or plural However, in the usage above, as in most scienti c and research usage, the word data is used as a collective noun referring to a body of work, and as such is properly treated as singular

Method bool ReadBoolean( ) byte ReadByte( ) sbyte ReadSByte( ) byte[ ] ReadBytes(int count) char ReadChar( ) char[ ] ReadChars(int count) decimal ReadDecimal( ) double ReadDouble( ) float ReadSingle( ) short ReadInt16( ) int ReadInt32( ) long ReadInt64( ) ushort ReadUInt16( ) uint ReadUInt32( ) ulong ReadUInt64( ) string ReadString( )

Description Reads a bool Reads a byte Reads an sbyte Reads count bytes and returns them as an array Reads a char Reads count characters and returns them as an array Reads a decimal Reads a double Reads a float Reads a short Reads an int Reads a long Reads a ushort Reads a uint Reads a ulong Reads a string that is represented in its internal, binary format, which includes a length specifier This method should only be used to read a string that has been written using a BinaryWriter

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Here is a program that demonstrates BinaryReader and BinaryWriter It writes and then reads back various types of data to and from a file

// Write and then read back binary data using System; using SystemIO; class RWData { static void Main() { BinaryWriter dataOut; BinaryReader dataIn; int i = 10; double d = 102356; bool b = true; string str = "This is a test"; // Open the file for output try {

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dataOut = new BinaryWriter(new FileStream("testdata", FileModeCreate)); } catch(IOException exc) { ConsoleWriteLine("Error Opening File:\n" + excMessage); return; } // Write data to a file try { ConsoleWriteLine("Writing " + i); dataOutWrite(i); ConsoleWriteLine("Writing " + d); dataOutWrite(d); ConsoleWriteLine("Writing " + b); dataOutWrite(b); ConsoleWriteLine("Writing " + 122 * 74); dataOutWrite(122 * 74); ConsoleWriteLine("Writing " + str); dataOutWrite(str); } catch(IOException exc) { ConsoleWriteLine("I/O Error:\n" + excMessage); } finally { dataOutClose(); } ConsoleWriteLine(); // Now, read the data try { dataIn = new BinaryReader(new FileStream("testdata", FileModeOpen)); } catch(IOException exc) { ConsoleWriteLine("Error Opening File:\n" + excMessage); return; } try { i = dataInReadInt32(); ConsoleWriteLine("Reading " + i); d = dataInReadDouble(); ConsoleWriteLine("Reading " + d); b = dataInReadBoolean(); ConsoleWriteLine("Reading " + b);

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Brad said, I should have caught this earlier, but I didn t This sentence should be a separate paragraph

d = dataInReadDouble(); ConsoleWriteLine("Reading " + d); str = dataInReadString(); ConsoleWriteLine("Reading " + str); } catch(IOException exc) { ConsoleWriteLine("I/O Error:\n" + excMessage); } finally { dataInClose(); } } }

The output from the program is shown here:

x dx + (x 2)(x + 1)

Writing Writing Writing Writing Writing Reading Reading Reading Reading Reading 10 102356 True 9028 This is a test 10 102356 True 9028 This is a test

If you examine the testdata file produced by this program, you will find that it contains binary data, not human-readable text Here is a more practical example that shows how powerful binary I/O is The following program implements a very simple inventory program For each item in the inventory, the program stores the item s name, the number on hand, and its cost Next, the program prompts the user for the name of an item It then searches the database If the item is found, the inventory information is displayed

/* Use BinaryReader and BinaryWriter to implement a simple inventory program */ using System; using SystemIO; class Inventory { static void Main() { BinaryWriter dataOut; BinaryReader dataIn; string item; // name of item int onhand; // number on hand double cost; // cost try { dataOut = new

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