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Compiler Error CS0664 

Error Message

Literal of type double cannot be implicitly converted to type 'type'; use an 'suffix' suffix to create a literal of this type

An assignment could not be completed; use a suffix to correct the instruction. The documentation for each type identifies the corresponding suffix for the type.

The following sample generates CS0664:

// CS0664.cs
class M
   static void Main()
      decimal m = 1.0;   // CS0664
      // try the following line instead
      // decimal m = 1.0M;