Csharp/C Sharp/Data Types/int

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Assign value to int variable

<source lang="csharp"> using System; class UnaryOpsApp { 

   static void Main(string[] args)
   {
       int a;
       a = -42;
       Console.WriteLine("{0}", a);
   }

} 

</source>


Assing value to int value

<source lang="csharp"> public class Values{ 

   static void Main( ) {
      int myInt = 7;
      System.Console.WriteLine("Initialized, myInt: {0}", myInt);
      myInt = 5;
      System.Console.WriteLine("After assignment, myInt: {0}",myInt);
   }
}
          
      </source>


Calculate: int and double

<source lang="csharp"> /* C# Programming Tips & Techniques by Charles Wright, Kris Jamsa Publisher: Osborne/McGraw-Hill (December 28, 2001) ISBN: 0072193794

  • /

namespace nsArea { 

   using System;
   public class Area
   {
       static public void Main ()
       {
           double Area;
           int Radius = 42;
           GetArea (Radius, out Area);
           Console.WriteLine ("The area of a circle with radius {0} is {1}",
                               Radius, Area);
       }
       static void GetArea (int radius, out double area)
       {
           const double pi = 3.14159;
           area = pi * radius * radius;
       }
   }

} 

      </source>


Calculating the product of three integers.

<source lang="csharp"> using System; public class Product { 

   public static void Main(string[] args) {
       int x;
       int y;
       int z;
       int result;
       Console.Write("Enter first integer: ");
       x = Convert.ToInt32(Console.ReadLine());
       Console.Write("Enter second integer: ");
       y = Convert.ToInt32(Console.ReadLine());
       Console.Write("Enter third integer: ");
       z = Convert.ToInt32(Console.ReadLine());
       result = x * y * z;
       Console.WriteLine("Product is {0}", result);
   }

} 

      </source>


Call methods from primitive data types

<source lang="csharp"> using System; using System.Collections.Generic; using System.Text; class Program { 

   static void Main(string[] args) {
       Console.WriteLine(12.GetHashCode());
       Console.WriteLine(12.Equals(23));
       Console.WriteLine(12.GetType().BaseType);
       Console.WriteLine(12.ToString());
       Console.WriteLine(12); // ToString() called automatically.
   }

} 

</source>


Catch OverflowException Exception

<source lang="csharp">

using System;

class MainClass { 

   public static void Main()
   {
       try
       {
           checked
           {
               int Integer1;
               int Integer2;
               int Sum;
  
               Integer1 = 9999999999;
               Integer2 = 2000000000;
               Sum = Integer1 + Integer2;
           }
       }
       catch(OverflowException)
       {
           Console.WriteLine("A mathematical operation caused an overflow.");
       }
   }

} 

      </source>


Comparing integers using if statements, equality operators, and relational operators.

<source lang="csharp">

using System; public class Comparison { 

  public static void Main( string[] args )
  {
     int number1; 
     int number2; 
     Console.Write( "Enter first integer: " );
     number1 = Convert.ToInt32( Console.ReadLine() );
     Console.Write( "Enter second integer: " );
     number2 = Convert.ToInt32( Console.ReadLine() );
     if ( number1 == number2 )
        Console.WriteLine( "{0} == {1}", number1, number2 );
     if ( number1 != number2 )
        Console.WriteLine( "{0} != {1}", number1, number2 );
     if ( number1 < number2 )
        Console.WriteLine( "{0} < {1}", number1, number2 );
     if ( number1 > number2 )
        Console.WriteLine( "{0} > {1}", number1, number2 );
     if ( number1 <= number2 )
        Console.WriteLine( "{0} <= {1}", number1, number2 );
     if ( number1 >= number2 )
        Console.WriteLine( "{0} >= {1}", number1, number2 );
  }

} 

      </source>


Convert string value to integer by using the int.TryParse

<source lang="csharp">

using System; public class MainClass { 

   public static void Main() {
       int i;
       bool failure = int.TryParse("qwerty", out i);
       bool success = int.TryParse("123", out i);
   }

} 

      </source>


demonstrates variables

<source lang="csharp"> using System;

public class Example2DemonstratesVariables { 

 public static void Main() {   
   int x; 
   int y; 
 
   x = 10;
 
   Console.WriteLine("x contains " + x);   
   y = x / 2;  
 
   Console.Write("y contains x / 2: ");  
   Console.WriteLine(y);  
 }

} 


      </source>


displays a conversion table of Fahrenheit to Celsius

<source lang="csharp"> /* 

  This program displays a conversion  
  table of Fahrenheit to Celsius. 

  Call this program FtoCTable.cs.
  • /

using System;

public class FtoCTable { 

 public static void Main() {  
   double f, c; 
   int counter; 

   counter = 0; 
   for(f = 0.0; f < 100.0; f++) { 
     c = 5.0 / 9.0 * (f - 32.0); // convert to Celsius 
     Console.WriteLine(f + " degrees Fahrenheit is " + 
                       c + " degrees Celsius."); 

     counter++; 

     // every 10th line, print a blank line        
     if(counter == 10) { 
       Console.WriteLine(); 
       counter = 0; // reset the line counter 
     } 
   } 
 }

} 

      </source>


Do calculation with int variable

<source lang="csharp"> using System; public class MainClass { 

   static void Main(string[] args) {
       int a;
       a = -42;
       Console.WriteLine("{0}", a);
       int b = 2;
       int c = 42;
       a = b * -c;
       Console.WriteLine("{0}", a);
   }

} 

</source>


Format int in Console.WriteLine

<source lang="csharp"> using System; public class TestConsoleApp { 

   public static void Main(string[] args)
   {
       Console.WriteLine(123);
       Console.WriteLine("{0}", 123);
       Console.WriteLine("{0:D3}", 123);
   }

} 

</source>


int array property

<source lang="csharp"> using System; public class SomeClass { 

   private int[] nums;
   public SomeClass(int i)
   {
       nums = new int[10];
       nums[0] = i;
   }
   public int[] Nums
   {
       get { return nums; }
       set { nums = value; }
   }

}

public class MainClass { 

   public static void Main(string[] args)
   {
       SomeClass sc = new SomeClass(42);
       Console.WriteLine("{0}", sc.Nums[0]);
  
       sc.Nums[0] = sc.Nums[0] + 5;
       Console.WriteLine("{0}", sc.Nums[0]);
   }

} 

</source>


int based Fahrenheit and Celsius (Centigrade) Scales

<source lang="csharp"> using System; public class Class1 { 

   public static void Main(string[] args) {
       int nFahr = 100;
       int nBaseFahr;
       nBaseFahr = nFahr - 32;
       int nCelsius;
       nCelsius = (nBaseFahr * 100) / (212 - 32);
       Console.WriteLine(nCelsius);
   }

} 

</source>


Integer OverFlow

<source lang="csharp"> using System;

class IntegerOverFlow { 

   static void Main(string[] args)
   {
       short s = 32767;
       s++;
       Console.WriteLine(s);
  
       ushort us = 0;
       us--;
       Console.WriteLine(us);
   }

} 

</source>


Parse int value

<source lang="csharp"> using System; public class Sum { 

 static void Main(String[] args) { 
   int sum = 0; 
   for (int i=0; i<args.Length; i++) 
     sum += int.Parse(args[i]); 
   Console.WriteLine("The sum is " + sum); 
 }

} 

</source>


Size of int, double, char and bool

<source lang="csharp"> /* C# Programming Tips & Techniques by Charles Wright, Kris Jamsa Publisher: Osborne/McGraw-Hill (December 28, 2001) ISBN: 0072193794

  • /

// // Sizes.cs -- returns the sixes of C# data types. // Compile with the following command line: // csc /unsafe sizes.cs // namespace nsSizes { 

   using System;
   struct TestStruct
   {
       int    x;
       double y;
       char   ch;
   }
   public class Sizes
   {
       static public unsafe void Main ()
       {
           Console.WriteLine ("The size of a bool is " + sizeof (bool));
           Console.WriteLine ("The size of a char is " + sizeof (char));
           Console.WriteLine ("The size of an int is " + sizeof (int));
           Console.WriteLine ("The size of a long is " + sizeof (long));
           Console.WriteLine ("The size of an double is " + sizeof (double));
           Console.WriteLine ("The size TestStruct is " + sizeof (TestStruct));
       }
   }

} 

      </source>


Some Operator on int

<source lang="csharp"> using System; public class MyMainClass10 { 

 static void Main(string[] args)  {
   int   a,b,c,d,e,f;
   a = 1;
   b = a + 6;
   c = b - 3;
   d = c * 2;
   e = d / 2;
   f = e % 2;
 }

} 


      </source>


The precision specifier controls the number of significant digits or zeros to the right of a decimal:

<source lang="csharp"> using System; public class FormatSpecApp { 

   public static void Main(string[] args) {
       int i = 123456;
       
       Console.WriteLine("{0:C5}", i);
       Console.WriteLine("{0:D5}", i);
       Console.WriteLine("{0:E5}", i);
       Console.WriteLine("{0:F5}", i);
       Console.WriteLine("{0:G5}", i);
       Console.WriteLine("{0:N5}", i);
       Console.WriteLine("{0:P5}", i);
       Console.WriteLine("{0:X5}", i);
   }

} 

</source>


Use #, % and <zero> in int format

<source lang="csharp"> using System; public class FormatSpecApp { 

   public static void Main(string[] args) {
       int i = 123456;
       Console.WriteLine();
       Console.WriteLine("{0:#0}", i);             // 123456
       Console.WriteLine("{0:#0;(#0)}", i);        // 123456
       Console.WriteLine("{0:#0;(#0);<zero>}", i); // 123456
       Console.WriteLine("{0:#%}", i);     // 12345600%
       i = -123456;
       Console.WriteLine();
       Console.WriteLine("{0:#0}", i);             // -123456
       Console.WriteLine("{0:#0;(#0)}", i);        // (123456)
       Console.WriteLine("{0:#0;(#0);<zero>}", i); // (123456)
       Console.WriteLine("{0:#%}", i);             // -12345600%
       i = 0;
       Console.WriteLine();
       Console.WriteLine("{0:#0}", i);             // 0
       Console.WriteLine("{0:#0;(#0)}", i);        // 0
       Console.WriteLine("{0:#0;(#0);<zero>}", i); // <zero>
       Console.WriteLine("{0:#%}", i);             // %
   }

} 

</source>


Use CultureInfo in int.ToString method

<source lang="csharp"> using System; using System.Globalization; public class NumParsingApp { 

   public static void Main(string[] args) {
       int k = 12345;
       CultureInfo us = new CultureInfo("en-US");
       string v = k.ToString("c", us);
       Console.WriteLine(v);
   }

} 

</source>


Use CultureInfo int ToString method

<source lang="csharp">

using System; using System.Globalization; using System.Threading; class Program { 

   static void Main(string[] args) {
       int val = 1234567890;
       Console.WriteLine(val.ToString("N"));
       Console.WriteLine(val.ToString("N",new CultureInfo("fr-FR")));
       Thread.CurrentThread.CurrentCulture = new CultureInfo("de-DE");
       Console.WriteLine(val.ToString("N"));
   }

} 

      </source>


Using Integers

<source lang="csharp"> using System; public class UsingIntegers { 

 static void Main(string[] args)
 {
   int MyInt = 12345;
   long MyLong = MyInt;
   
 }
 public long My2ndFunction(long MyLong)
 {
   try
   {
     long c = checked(MyLong * 500);
   }
   catch (OverflowException e)
   {
     Console.WriteLine(e);
   }
   return 0;
 }

} 

      </source>


Using Variables

<source lang="csharp"> using System; public class UsingVariables { 

 static void Main(string[] args)
 {
   int MyInt = 12345;
   int MyInt2 = MyInt + 1;
   int MyInt3;
   MyInt3 = My2ndFunction(MyInt2);
 }
 static public int My2ndFunction(int myInt2)
 {
   myInt2 = myInt2 * 2;
   return myInt2;
 }

} 

      </source>
Источник — «http://nfex.ru/index.php?title=Csharp/C_Sharp/Data_Types/int&oldid=1391»