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8. Numbers and Dates
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be used. If no meaningful conversion System.InvalidCastException is thrown.
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between
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types,
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The IConvertible interface also includes the GetTypeCode member. GetTypeCode returns a member of the System.TypeCode enumeration that uniquely identifies the implementing type. Although the inbuilt numeric types implement IConvertible, explicit interface implementation means it is not possible to invoke IConvertible members through an instance of the numeric type. The .NET documentation recommends conversion of numeric types be carried out using the static members of the System.Convert utility class as opposed to invoking IConvertible members directly. Alternatively, the implicit and explicit conversion support in C# is sufficient for most purposes. We'll discuss the System.Convert class later, in the "Converting Numbers" section.
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Members
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Aside from the methods required by the interface implementations described earlier, all numeric types implement the members described in Table 8-1.
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Table 8-1. Numeric Type Members
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Member Public Fields MaxValue MinValue Methods Equals()
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Description Constant containing the maximum value representable by the numeric type. Constant containing the minimum value representable by the numeric type.
Overridden method inherited from System.Object. Returns true if the argument provided is of the same type and value as the instance; otherwise, returns false. Implicit conversion is not used; however, explicitly casting types with the same value will return true. The ToString method inherited from System.Object is overridden and calls ToString() the overloaded IFormattable.ToString method, passing it default formatting arguments. GetHashCode() Overridden. Returns a hash code appropriate to the numeric type. Inherited from System.Object. Returns a Type object for the numeric type. GetType() Converts a string representation of a number to an instance of the numeric Parse() type.
Floating-point members
System.Single and System.Double contain additional members, described in Table 8-2, to support floating-point operations.
Table 8-2. Additional System.Single and System.Double Members
Member Public Fields Epsilon
Description Constant containing the smallest positive value greater than 0 representable by the floating-point type.
8. Numbers and Dates
NaN NegativeInfinity PositiveInfinity Methods IsInfinity
Constant representing "Not a Number." Constant representing negative infinity. Constant representing positive infinity.
Static method returns true if the specified number evaluates to negative or positive infinity. Static method returns true if the specified number evaluates to a value that IsNaN is not a number. Static method returns true if the specified number evaluates to negative IsNegativeInfinity infinity. IsPositiveInfinity Static method returns true if the specified number evaluates to positive infinity. Converts a string representation of a floating-point number to an instance TryParse() of the numeric type. Returns true if the string is parsed successfully; does not throw an exception.
Decimal members
The System.Decimal type directly exposes methods to perform basic mathematical operations on Decimal instances. While these may be useful for programmers of languages other than C#, they provide no benefit over using the inbuilt C# syntax and will not be covered here.
Converting Numbers
C# language syntax supports implicit and explicit conversion from one numeric type to another. The .NET class library also includes a utility class named System.Convert that contains static methods for converting from one numeric type to another, including support for conversions between numbers and bool, string, and DateTime values. The Convert class implements the following static methods: ToBoolean, ToByte, ToChar, ToDateTime, ToDecimal, ToDouble, ToInt16, ToInt32, ToInt64, ToSByte, ToSingle, ToString, ToUInt16, ToUInt32, and ToUInt64. Each of these methods provides overloads that take each of the numeric types and return the appropriately converted value. If no meaningful conversion exists between two types, a System.InvalidCastException is thrown.
Formatting Numbers
All numeric types implement the IFormattable interface. IFormattable specifies the implementation of a ToString method with the following signature:
string ToString(string format, IFormatProvider formatProvider);
The format argument takes what's called a numeric format string, which determines how the number is formatted. The formatProvider argument provides information on localization setting to assist in the formatting process. If formatProvider is null, default localization settings are used.
8. Numbers and Dates
In the following example, we use the numeric format string E2, which indicates scientific notation to two decimal places, and we specify null as the IFormatProvider so that the default localization settings are used.
int SomeInt = 1234567; System.Console.WriteLine(SomeInt.ToString("E2", null));
The code produces the following output:
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