C# Predefined Type Taxonomy

Predefined types in C#

The predefined types in C# are:

• Value types
  • Numeric
    • Signed integer (sbyte, short, int, long)
    • Unsigned integer (byte, ushort, uint, ulong)
    • Real number (float, double, decimal)
  • Logical (bool)
  • Character (char)
• Reference types
• String (string)
• Object (object)

Predefined types alias

Predefined types in C# alias Framework types in the System namespace. There is only a syntactic difference between these two statements:

      int i = 5; 
      System.Int32 i = 5;