After the programmer gaves a programming language, the first thing is what data type it has, how to use them. In this section, I will introduce the C # data type and how to use them in the program.
◆ Basic data type
Most of the data types in C # are from the C and C languages. Please see the following table:
type of data
description
Example
Object
All other types of base classes
Object obj = NULL;
String
String Type - A Series of Unicode characters
String str = "mahesh";
Sbyte
8-bit has symbol integer
Sbyte Val = 12;
Short
16-bit is symbolic
Short Val = 12;
int
32-bit with symbol integer
INT VAL = 12;
Long
64-bit with symbol integer
Long Val1 = 12; long Val2 = 34L;
Bool
Boolean; UELE or FALSE two values
BOOL VAL1 = true; BOOL VAL2 = FALSE;
charr
Character type; Unicode character
CHAR VAL = 'h';
Byte
8-bit unsigned integer
BYTE VAL1 = 12; byte Val2 = 34u;
Ushort
16-bit unsigned integer
Ushort VAL1 = 12; Ushort Val2 = 34U;
Uint
32-bit unsigned integer
UINT VAL1 = 12; UINT VAL2 = 34U;
Ulong
64-bit unsigned integer
Ulong Val1 = 12; Ulong Val2 = 34u; Ulong Val3 = 56L; Ulong Val4 = 78UL;
Float
Single precision floating point
FLOAT VAL = 1.23F;
Double
Double precision floating point number
Double Val1 = 1.23; Double Val2 = 4.56d;
Decimal
High-precision 128-bit data type (for currency, etc.)
Decimal Val = 1.23M;
◆ Types in C #
C # support two types: numeric type and reference type
Types of
description
Numeric type
Including simple data types, it is better to speak int, char, bool, enums
Reference type
Includes objects, classes, interfaces, proxy and array types
Value type - numeric type object variables directly contain real data. For numerical types, each variable has a copy of their own data, and it is impossible to affect another variable by operating a variable. E.g:
INT i = 10;
Reference Type - Reference Type Variable Stores a reference to real data. For reference types, two variables point to the same object may be implemented, so it can affect the other variable by operating a variable. E.g:
Myclass cls1 = new myclass ();
◆ Data type conversion
C # supports two types of conversion, implicit conversion, and explicit conversion.
(1) Implicit conversion is direct conversion. E.g:
INT IVAL = 34; Long Lval = INTVALUE;
(2) Explicit conversion contains a mandatory type conversion. E.g:
Long lval = 123456; int = (int) LVAL;
