Answer / shatrughan singh

There are eight predefined types in ABAP with fixed length:
Four character types: Character (C), Numeric character (N), Date (D), and Time (T).
One hexadecimal type: Byte field (X).
Three numeric types: Integer (I), Floating-point number (F) and Packed number (P).
There are two predefined types in ABAP with variable length:
STRING for character strings , XSTRING for byte strings
Complex type.
structure type.
Reference type.
Data reference
Object Reference
class reference

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