point flottant - Différence entre décimal, flottant et double dans .NET

92

10001.10010110011 

12345.65789 

88

float flt = 1F/3; double dbl = 1D/3; decimal dcm = 1M/3; Console.WriteLine("float: {0} double: {1} decimal: {2}", flt, dbl, dcm); 

float: 0.3333333   double: 0.333333333333333   decimal: 0.3333333333333333333333333333 

73

+---------+----------------+---------+----------+---------------------------------------------------------+ | C#      | .Net Framework | Signed? | Bytes    | Possible Values                                         | | Type    | (System) type  |         | Occupied |                                                         | +---------+----------------+---------+----------+---------------------------------------------------------+ | sbyte   | System.Sbyte   | Yes     | 1        | -128 to 127                                             | | short   | System.Int16   | Yes     | 2        | -32,768 to 32,767                                       | | int     | System.Int32   | Yes     | 4        | -2,147,483,648 to 2,147,483,647                         | | long    | System.Int64   | Yes     | 8        | -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 | | byte    | System.Byte    | No      | 1        | 0 to 255                                                | | ushort  | System.Uint16  | No      | 2        | 0 to 65,535                                             | | uint    | System.UInt32  | No      | 4        | 0 to 4,294,967,295                                      | | ulong   | System.Uint64  | No      | 8        | 0 to 18,446,744,073,709,551,615                         | | float   | System.Single  | Yes     | 4        | Approximately ±1.5e-45 to ±3.4e38                       | |         |                |         |          |  with ~6-9 significant figures                          | | double  | System.Double  | Yes     | 8        | Approximately ±5.0e-324 to ±1.7e308                     | |         |                |         |          |  with ~15-17 significant figures                        | | decimal | System.Decimal | Yes     | 16       | Approximately ±1.0e-28 to ±7.9e28                       | |         |                |         |          |  with 28-29 significant figures                         | | char    | System.Char    | N/A     | 2        | Any Unicode character (16 bit)                          | | bool    | System.Boolean | N/A     | 1 / 2    | true or false                                           | +---------+----------------+---------+----------+---------------------------------------------------------+