Ii. Data Types

Using system; using system. collections. generic; using system. LINQ; using system. text; namespace _ 2. data type {class program {static void main (string [] ARGs) {// Integer type byte mybyte = 80; ushort myushort = 67; int Myint =-99; ulong myulong = 45679788; console. writeline ("mybyte: {0}", mybyte); console. writeline ("myushort: {0}", myushort); console. writeline ("Myint: {0}", Myint); console. writeline ("myulong: {0} ", Myulong); // floating point type/* because the floating point literal value is double by default, * when assigning values to float and decimal variables, you must add a suffix after. * The suffix f or F must be added to a float variable. * For a variable of the double type, the suffix D or D must be added. * For decimal type variables, the suffix m or m must be added. */Float myfloat = 3.14f; double mydouble = 56.4689; decimal mydecimal = 45487.54679796464 m; console. writeline ("myfloat: {0}", myfloat); console. writeline ("mydouble: {0}", mydouble); console. writeline ("mydecimal: {0}", mydecimal); // character type char mychar = 'a'; console. writeline ("mychar: {0}", mychar); // Boolean bool mybool = true; console. writeline ("mybool: {0}", mybool); // object type object myobject = 100; console. writeline ("myobject type: {0}, value: {1}", myobject. getType (), myobject); // dynamic type Dynamic mydynamic = 'a'; console. writeline ("mydynamic type: {0}, value: {1}", mydynamic. getType (), mydynamic); // string type string mystring = "Hello, world"; console. writeline ("mystring: {0}", mystring); // sizeof method // usage: sizeof (type) console. writeline ("int type occupies {0} bytes", sizeof (INT); console. readkey (); }}/ *** 1. The value type * is derived from the system. valuetype class. * (1) Integer type (default value: 0) * A) signed integer type * sbyte alias system. byte occupies 1 byte * short alias system. int16 occupies 2 bytes * int alias system. int32 occupies 4 bytes * long alias system. int64 occupies 8 bytes * B) the unsigned integer type * byte alias system. sbyte occupies 1 byte * ushort alias system. uint16 occupies 2 bytes * uint alias system. uint32 occupies 4 bytes * ulong alias system. uint64 occupies 8 bytes * (2) floating point type * float alias system. single occupies 4 bytes. The default value is 0.0f * Double alias system. double occupies 8 bytes. The default value is 0.0d * float and double type. +/-M * 2 ^ e The m and E values vary by type. ** The decimal alias system. Decimal occupies 16 bytes. The default value is 0.0 M * the decimal type is expressed in the form of +/-M * 10 ^ e. * (3) character type (unsigned type), which can represent Unicode characters and can store Chinese characters. * Char alias system. char occupies 2 bytes. The default value is '\ 0' * (4) boolean type * bool alias system. boolean boolean values: true and false; default value: false ** 2. Reference Type * (1) object type * object type: C # Common Type System) the ultimate base class of all data types in. * Objects can be assigned values of any other types (value type, reference type, pre-defined type, or user-defined type. * Object type variables are checked during compilation. * (2) dynamic type * dynamic type variables can store values of any type. * Type check is performed for dynamic type variables at runtime. * (3) string type * the string type allows variable allocation of any string without length restrictions. * The string type is the alias of the system. string class. ** 3. pointer type * the pointer type variable stores another type of memory address. * Declare pointer type Syntax: * type * identifier; ** example: * char * cptr; * int * iptr ;**/

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Ii. Data Types