Uploaded byZeeshan Ahmad
7.data types in c#
This document summarizes data types in C#, including value types (such as int, float, enumerations, and structs), reference types (such as objects, strings, classes, arrays, and delegates), and how everything inherits from System.Object. It explains that value types directly contain variable data while reference types contain a reference to the data. The document also outlines the hierarchies for value types and reference types.
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7.data types in c#
- 1. Data Types inC#Data Types in C# Made By; Malik Zeeshan Ahmed
- 3. C# Data TypesC#Data Types Value types Pre-defined: ◦ int, uint, float, etc. User-defined: ◦ Structures and Enumerations Reference types Pre-defined: ◦ Objects ◦ Strings User-defined: ◦ Classes ◦ Arrays ◦ Delegates ◦ Interfaces Everything inherits from System.Object
- 4. C# Value vs.Reference • Value Types “directly contain” the variable data. – Example: int, float, enum, struct... • Reference Types contain a reference to the data Memory int x int y myObject Reference Type Memory ref0 ref1 Value TypeReference Type Memory ref0 ref1 myObject Memory ref0 ref1 Reference Type myObject Memory ref0 ref1 Reference Type myObject Memory ref0 ref1 Reference Type Memory ref0 ref1 myObject Reference Type Memory ref0 ref1
- 5. class ValueType • ValueTypeis a class that inherits directly from object – You cannot inherit from ValueType • ValueType overrides System.Object methods so they make sense
- 6. Value typeValue type value-types inherit directly from ValueType ◦ Built in types(bool,int,…etc) ◦ enum types ◦ struct types All value-types are sealed value-types cannot be null Assignment of a value-type results in a copy of the variable
- 7. value-type Hierarchy value-type struct-type enum-type type-namesimple-type numeric-typebool type-name floating-point-typeintegral-type decimal
- 8. Reference Types • Classes –object (System.Object) – string – user-defined classes • Interfaces • Arrays • Delegates – delegate (System.Delegate)
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