Iv. Constants

using system;using system.collections.generic;using system.linq;using system.text; Namespace _4. Constant {    class program    {         static void main (String[] args)          {            //  Integral type Constants              uint myUint = 456;             console.writeline ("myUint = {0}",  myuint);             long mylong =  79854456l;            console.writeline (" Mylong = {0} ",  mylong);                         //  floating-point constants              float myFloat = 3.14F;             console.writeline ("myfloat = {0}",  myfloat);             double myDouble = 3.14E55;             console.writeline ("mydouble = {0}",  myDouble);                          //  character-type constants              console.writeline ("Backslash: "  +  ' \ \ ');             console.writeline ("single quote: "  +  "\");            &nbsp Console.WriteLine ("Double quote: "  +  "');             console.writeline ("Warning sound: "  +  ' \a ');             console.writeline ("Backspace: "  +  ' \b ');             console.writeline ("Page break: "  +  ' \f ');             console.writeline ("line break: "  +  ' \ n ');             console.writeline ("carriage return: "  +  ' \ R ');             console.writeline ("Horizontal tab: "   +  ' \ t ');             console.writeline ("Vertical tab:   " +  ' \v ');             Console.WriteLine ("\\u0061:  " +  ' \u0061 ');                         //  string Constants              string myString1 =  "Hello world";             console.writeline ("myString1: "  + &NBSP;MYSTRING1);            //  Ordinary string constants cannot be allocated on multiple lines             string mystring2  = @ "hello                             world ";             console.writeline ("mystring2: "  + myString2);             //  if the literal specified string contains "need to be escaped to avoid ending the string."             string path1 =  "c:\\ Windows\\mydir ";             console.writeline (" path1:  " + path1);             string path2 = @ "C:\Windows\MyDir";             console.writeline ("path2: "  + path2);        The      //  string is a reference type and can be assigned null.                          //  Boolean Constants              bool myBool = true;             consOle. WriteLine ("mybool: {0}",  mybool);                         //  Defining Constants              const float PI = 3.14F;             console.writeline ("PI: "  + PI);             // PI = 3.1415926F;             // console.writeline ("PI: " &NBSP;+&NBSP;PI) The value of the;            //  constant cannot be modified after it is assigned.                          console.readkey ();        }     }}/** *  the basic concepts  * 1.  constants of constants are fixed values that do not change during program execution.  * 2.  constants can be used as regular variables, except that their values cannot be modified after they are defined.  *  *  Classification of constants  *  (1)   integer constants  *  integer constants can be expressed in decimal, octal, and 16 binary formats.  *  hexadecimal representation: prefixed with 0x and 0X.  *  octal representation: prefixed with 0.  *  decimal representation: no prefix.  *  *  integer constants can also have suffixes, and u represents unsigned,l for long.  * int,uint,long,ulong can be no suffix.  * uint,ulong is indicated by the suffix U.  * long,ulong is indicated by the suffix L.  * ulong can be represented by the suffix ul,ul,ul,ul,lu,lu,lu,lu.  *  *  (2)   floating-point constants  *  floating-point constants consist of integral parts, decimal points, fractional parts, and exponential portions.  *  floating-point constants are represented in both decimal and exponential form.  *  when you use decimal notation, you must include a decimal point, an exponent, or both.  *  When you use an exponential form, you must include an integer part, a fractional part, or both.  *  signed indices are expressed in E and E.  *  *  (3)   character constants  *  character constants are enclosed in single quotes and can be stored in a simple character-type variable. The  *  character constants are divided into: ordinary characters, escape sequences, and universal characters.  *  escape character sequence: *  \\    backslash     \ '    single quote       \a   Warning &NBSP;*&NBSP;  \ "    nickname     \b   backspace  *  \f    Page break     \n   line feed      \r   carriage return  *   \t    horizontal tab Stop   \v   vertical tab stop  *  \uxxxx   4 bit hexadecimal value  *   *  (4)   string constant  * 1.  normal string  * 2.  verbatim specifying string, using the @ symbol  *  *  Define constants  *  Use the Const keyword to define constants.  *  Defining Syntax: *  const <data_type> <constant_name> = < value>; *  *  parameter Parsing: * <data_type>:  valid C # data types  * < constant_name>:  constant name  * <value>:  value  */

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Iv. Constants