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You can learn more about implicit conversion later in this chapter.
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Using Literal Prefixes
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There are only three prefixes for numeric literals. They are described in Table 5-4.
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CHAPTER 5 NUMERIC AND BOOLEAN TYPES
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Table 5-4. Numeric Literal Prefixes
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Prefix
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0x + -
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Specifies that the value is expressed in hexadecimal Specifies that the value is positive Specifies that the value is negative
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Literals that have neither the + nor prefix are assumed to be positive. Listing 5-3 demonstrates the use of the literal prefixes. Listing 5-3. Using the Numeric Literal Prefixes using System; class Listing 03 { static void Main(string[] args) { // use the hex prefix int hex = 0xFF; // explicitly specify a positive number short pos = +23; // explicitly specify a negative number short neg = -23; // print out the values Console.WriteLine("Hex: {0}", hex); Console.WriteLine("Pos: {0}", pos); Console.WriteLine("Neg: {0}", neg); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } Compiling and running the code in Listing 5-3 produces the following results: Hex: 255 Pos: 23 Neg: -23 Press enter to finish
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CHAPTER 5 NUMERIC AND BOOLEAN TYPES
Implicit and Explicit Numeric Type Conversions
When you assign one numeric type to another, C# will try to handle the conversion for you. Some numeric type conversions can be done for you automatically; these are called implicit conversions. Other type conversions require you to state which type conversion is required; these are called explicit conversions. Implicit conversions don t require you to take any special steps. Listing 5-4 demonstrates some implicit conversions. Listing 5-4. Implicit Numeric Type Conversions long l1 = 45; long l2 = 20 + 25; int i = 50; long l3 = i; long l4 = i + 25; The statements in Listing 5-4 show various implicit conversions from int to long. Remember that C# will implicitly type numeric literals to int by default if it can, so assigning a literal to a long like this is an implicit conversion from an int to a long. Implicit conversions are supported where converting from one type to another is harmless; in other words, the largest possible value represented by the original type can be represented equally well by the new type. The actual value assigned to a numeric type isn t taken into account only the maximum possible value that the data type can represent. Table 5-5 summarizes the supported implicit numeric type conversions. Table 5-5. Implicit Numeric Type Conversions
Original Type
sbyte byte short ushort int uint long ulong float
Supported Types for Implicit Conversion
short, int, long, float, double, decimal short, ushort, int, uint, long, ulong, float, double, decimal int, long, float, double, decimal int, uint, long, ulong, float, double, decimal long, float, double, decimal long, ulong, float, double, decimal float, double, decimal float, double, decimal double
CHAPTER 5 NUMERIC AND BOOLEAN TYPES
An explicit conversion is required when converting from one numeric type to another may affect the value that is stored. To make an explicit conversion, you use the cast expression, for example: int i = 20; byte b = (byte)i; In these statements, I define an int and then cast it to a byte, thereby performing an explicit conversion. Table 5-6 summarizes the supported explicit numeric conversions. Table 5-6. Explicit Numeric Type Converions
Original Type
sbyte byte short ushort int uint long ulong float double decimal
Supported Types for Explicit Conversion
byte, ushort, uint, ulong sbyte sbyte, byte, ushort, uint, ulong sbyte, byte, short sbyte, byte, short, ushort, uint, ulong sbyte, byte, short, ushort, int sbyte, byte, short, ushort, int, uint, ulong sbyte, byte, short, ushort, int, uint, long sbyte, byte, short, ushort, int, uint, long, ulong, decimal sbyte, byte, short, ushort, int, uint, long, ulong, float, decimal sbyte, byte, short, ushort, int, uint, long, ulong, float, double
If you compare Table 5-5 and Table 5-6, you will see that every numeric type can be converted to every other numeric type, either implicitly or explicitly. Explicit conversions can be troublesome; Listing 5-5 contains an example. Listing 5-5. Problems Performing Implicit Conversions using System; class Listing 05 { static void Main(string[] args) {
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