Advertisement
Not a member of Pastebin yet?
Sign Up,
it unlocks many cool features!
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Text;
- using System.Threading.Tasks;
- namespace MyAppSTD2018
- {
- class Program
- {
- static void Main(string[] args)
- {
- // I. Types have: name (e.g. int), size, default value
- // II. Variables have: name (A-Za-z_0-9 all utf-8, can't start with 0-9, can't be a keyword), type, value
- // built-in types:
- //1. integer (default = 0)
- byte myByte = 23; // unsigned 8-bis (0 to 255) default = 0
- sbyte mySByte = -128; // signed 8-bit (-128 to 127) default = 0
- short myShort = -1000; // signed 16-bit (-32,768 to 32,767)
- ushort myUshort = 2000; // unsigned 16-bit (0 to 65,535)
- int myVar = 4; // signed 32-bit (-2,147,483,648 to 2,147,483,647)
- int myVar2 = 5; // signed 32-bit (-2,147,483,648 to 2,147,483,647)
- int sum = myVar + myVar2; // signed 32-bit (-2,147,483,648 to 2,147,483,647)
- uint myUint = 12000U; // unsigned 32-bit (0 to 4, 294, 967, 295)
- sum = 0xA8F1; // hexadecimal literal
- sum = 0XA8F1; // hexadecimal literal
- long myLong = 42432L;// signed 64-bit (-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807)
- ulong myUlong = 23423423U; // unsigned 64-bit (0 to 18,446,744,073,709,551,615)
- ulong maxIntValue = UInt64.MaxValue;
- Console.WriteLine(maxIntValue); // 18446744073709551615
- // 2. Real (default 0.0 for F/f D/d M/m)
- float myFloat = 4.566F; // signed 32-bit (±1.5e-45 to ±3.4e38) up to 7 symbols/digits
- myFloat = 67.8E35f; // litteral with "E/e"
- double myDouble = 34.56d; // signed 64-bit (±5.0e-324 to ±1.7e+308) up to 15-16 symbols/digits
- myDouble = -3.4e-10d;
- decimal myDecimal = 23.45M; // signed 128-bit (±1.0e-28 to ±7.9e28) precission 28-29 symbols/digits, closest to 0 ±1.0e-28, decimal floating-point arithmetic
- // Declare some variables
- float floatPI = 3.141592653589793238f;
- double doublePI = 3.141592653589793238;
- // Print the results on the console
- Console.WriteLine("Float PI is: " + floatPI); // Float PI is: 3.141593 only 7 digits
- Console.WriteLine("Double PI is: " + doublePI); // Double PI is: 3.14159265358979 16 digits
- decimal decimalPI = 3.14159265358979323846m;
- Console.WriteLine(decimalPI); // 3.14159265358979323846
- // 3. Char
- char myFirstLetter = 'S';
- Console.WriteLine((int)myFirstLetter);
- char symbol = (char)5;
- char myChar = '\u0065';
- Console.WriteLine(myChar);
- myChar = '\uffff';
- Console.WriteLine(myChar);
- // escaping
- char myEscape = '\n'; // \n \t \r \' \\ \" \uXXXX
- // 4. String (default null) Reference, value in the heap
- string myName = "Stoyan Cheresharov";
- string path = @"D:\CamtasiaVideos"; // instead of D:\\CamtasiaVideos
- Console.WriteLine($"The Path is {path}");
- // 5. Bool (default false)
- bool myBool = true; // false | true
- // 6. Object (default null) Reference, value in the heap
- Object myObject = 3;
- Nullable<int> i1 = null;
- int? i2 = i1;
- // typeof()
- // Console.WriteLine(typeof(i1)); // error
- // Used to obtain the System.Type object for a type. A typeof expression takes the following form:
- System.Type type = typeof(int);
- int i = 0;
- type = i.GetType();
- Console.WriteLine(type);
- // sizeof - Used to obtain the size in bytes for an unmanaged type.
- Console.WriteLine(sizeof(sbyte)); // 1
- // Unmanaged types include:
- // The simple types that are listed in the following table:
- // Expression Constant value
- //sizeof(sbyte) 1
- //sizeof(byte) 1
- //sizeof(short) 2
- //sizeof(ushort) 2
- //sizeof(int) 4
- //sizeof(uint) 4
- //sizeof(long) 8
- //sizeof(ulong) 8
- //sizeof(char) 2(Unicode)
- //sizeof(float) 4
- //sizeof(double) 8
- //sizeof(decimal) 16
- //sizeof(bool) 1
- Console.WriteLine("Hello World! The sum is " + sum);
- }
- }
- }
Advertisement
Add Comment
Please, Sign In to add comment
Advertisement