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C# Lesson Chapter two for program .ppt
- 2. Data type, Operators and keywords to C# Chapter 2
- 3. Lecturer Name: Rage Abdukadir Hussein Tel: 0615717504 Email:cadde7175@gmail.com
- 4. Outlines C# Data Types C# operators C# Keywords
- 5. A data type specifies the type of data that a variable can store such as integer, floating, character etc. C# Data Types
- 6. There are 3 types of data types in C# language. C# Data Types Types Data Types Value Data Type short, int, char, float, double etc Reference Data Type String, Class, Object and Interface Pointer Data Type Pointers
- 7. The value data types are integer-based and floating-point based. C# language supports both signed and unsigned literals. There are 2 types of value data type in C# language. 1) Predefined Data Types - such as Integer, Boolean, Float, etc. 2) User defined Data Types - such as Structure, Enumerations, etc. The memory size of data types may change according to 32 or 64 bit operating system. Let's see the value data types. It size is given according to 32 bit OS. Value Data Type
- 8. Data Types Data Types Memory Size Range char 1 byte -128 to 127 signed char 1 byte -128 to 127 unsigned char 1 byte 0 to 127 short 2 byte -32,768 to 32,767 signed short 2 byte -32,768 to 32,767 unsigned short 2 byte 0 to 65,535 int 4 byte -2,147,483,648 to -2,147,483,647 signed int 4 byte -2,147,483,648 to -2,147,483,647
- 9. Data Types unsigned int 4 byte 0 to 4,294,967,295 long 8 byte ?9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 signed long 8 byte ?9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 unsigned long 8 byte 0 - 18,446,744,073,709,551,615 float 4 byte 1.5 * 10-45 - 3.4 * 1038 , 7-digit precision double 8 byte 5.0 * 10-324 - 1.7 * 10308 , 15-digit precision decimal 16 byte at least -7.9 * 10?28 - 7.9 * 1028 , with at least 28-digit precision
- 10. The reference data types do not contain the actual data stored in a variable, but they contain a reference to the variables. If the data is changed by one of the variables, the other variable automatically reflects this change in value. There are 2 types of reference data type in C# language. 1) Predefined Types - such as Objects, String. 2) User defined Types - such as Classes, Interface. Reference Data Type
- 11. The pointer in C# language is a variable, it is also known as locator or indicator that points to an address of a value. Pointer Data Type
- 12. Declaring a pointer The pointer in C# language can be declared using * (asterisk symbol). int * a; //pointer to int char * c; //pointer to char Symbols used in pointer Symbol Name Description & (ampersand sign) Address operator Determine the address of a variable. * (asterisk sign) Indirection operator Access the value of an address.
- 13. An operator is simply a symbol that is used to perform operations. There can be many types of operations like arithmetic, logical, bitwise etc. There are following types of operators to perform different types of operations in C# language. Arithmetic Operators Relational Operators Logical Operators Bitwise Operators Assignment Operators Unary Operators Ternary Operators Misc Operators C# operators
- 14. Operators
- 15. The precedence of operator specifies that which operator will be evaluated first and next. The associativity specifies the operators direction to be evaluated, it may be left to right or right to left. Let's understand the precedence by the example given below: int data= 10+ 5*5 The "data" variable will contain 35 because * (multiplicative operator) is evaluated before + (additive operator). Precedence of Operators in C#
- 16. A keyword is a reserved word. You cannot use it as a variable name, constant name etc. In C# keywords cannot be used as identifiers. However, if we want to use the keywords as identifiers, we may prefix the keyword with @ character. C# Keywords
- 17. A list of Reserved Keywords available in C# programming language is given below: abstract base as bool break catch case byte char checked class const continue decimal private protected public return readonly ref sbyte explicit extern false finally fixed float for foreach goto if implicit in in (generic modifier) int ulong ushort unchecked using unsafe virtual void null object operator out out (generic modifier) override params default delegate do double else enum event sealed short sizeof stackalloc static string struct switch this throw true try typeof uint abstract base as bool break catch case volatile while
- 18. Any Questions??? THANK YOU FOR YOUR ATTENTION END OF CHAPTER