static void Main(string[] args){Console.WriteLine("   byte  {0,7:g}{1,32:g}{2,32:g}",typeof(byte).Name, byte.MinValue, byte.MaxValue);Console.WriteLine("  sbyte  {0,7:g}{1,32:g}{2,32:g}",typeof(sbyte).Name, sbyte.MinValue, sbyte.MaxValue);Console.WriteLine("  short  {0,7:g}{1,32:g}{2,32:g}", typeof(short).Name, short.MinValue, short.MaxValue);Console.WriteLine(" ushort  {0,7:g}{1,32:g}{2,32:g}", typeof(ushort).Name, ushort.MinValue, ushort.MaxValue);Console.WriteLine("    int  {0,7:g}{1,32:g}{2,32:g}",typeof(int).Name, int.MinValue, int.MaxValue);Console.WriteLine("   uint  {0,7:g}{1,32:g}{2,32:g}",typeof(uint).Name, uint.MinValue, uint.MaxValue);Console.WriteLine("   long  {0,7:g}{1,32:g}{2,32:g}",typeof(long).Name, long.MinValue, long.MaxValue);Console.WriteLine("  ulong  {0,7:g}{1,32:g}{2,32:g}",typeof(ulong).Name, ulong.MinValue, ulong.MaxValue);Console.WriteLine("  float  {0,7:g}{1,32:g}{2,32:g}", typeof(float).Name, float.MinValue, float.MaxValue);Console.WriteLine(" double  {0,7:g}{1,32:g}{2,32:g}", typeof(double).Name, double.MinValue, double.MaxValue);Console.WriteLine("decimal  {0,7:g}{1,32:g}{2,32:g}",typeof(decimal).Name, decimal.MinValue, decimal.MaxValue);
}

   byte     Byte                               0                             255sbyte    SByte                            -128                             127short    Int16                          -32768                           32767ushort   UInt16                               0                           65535int    Int32                     -2147483648                      2147483647uint   UInt32                               0                      4294967295long    Int64            -9223372036854775808             9223372036854775807ulong   UInt64                               0            18446744073709551615float   Single                   -3.402823e+38                    3.402823e+38double   Double          -1.79769313486232e+308           1.79769313486232e+308
decimal  Decimal  -79228162514264337593543950335   79228162514264337593543950335

double a = 12.3;
System.Double b = 12.3;