Csharp/C Sharp/Development Class/Math

Demonstrate Math.Sin(), Math.Cos(), and Math.Tan().

/*
C#: The Complete Reference 
by Herbert Schildt 
Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
//  Demonstrate Math.Sin(), Math.Cos(), and Math.Tan(). 
 
using System; 
 
public class Trigonometry {    
  public static void Main() {    
    Double theta; // angle in radians 
     
    for(theta = 0.1; theta <= 1.0; theta = theta + 0.1) { 
      Console.WriteLine("Sine of " + theta + "  is " + 
                        Math.Sin(theta)); 
      Console.WriteLine("Cosine of " + theta + "  is " + 
                        Math.Cos(theta)); 
      Console.WriteLine("Tangent of " + theta + "  is " + 
                        Math.Tan(theta)); 
      Console.WriteLine(); 
    } 
 
  }    
}

Find the radius of a circle given its area.

/*
C#: The Complete Reference 
by Herbert Schildt 
Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
// Find the radius of a circle given its area. 
 
using System; 
 
public class FindRadius {    
  public static void Main() {    
    Double r; 
    Double area; 
 
    area = 10.0; 
 
    r = Math.Sqrt(area / 3.1416); 
 
    Console.WriteLine("Radius is " + r); 
  }    
}

Math.Abs

 
using System;
public class MainClass {
    public static void Main() {
        Console.WriteLine("Math.Abs(5) = {0}", Math.Abs(5));
        Console.WriteLine("Math.Abs(-5) = {0}", Math.Abs(-5));
        Console.WriteLine("Math.Abs(0) = {0}", Math.Abs(0));
    }
}

Math.Min

 
using System;
public class MainClass {
    public static void Main() {
        int i = 5;
        Console.WriteLine("Math.Min(1,2) = {0}", Math.Min(i, 2.5F));
    }
}

Math operators

 
using System;
class MathOpsApp
{
    static void Main(string[] args)
    {
        Random rand = new Random();
        int a, b, c;
   
        a = rand.Next() % 100; // Limit max to 99.
        b = rand.Next() % 100; // Limit max to 99.
   
        Console.WriteLine("a={0} b={1}", a, b);
   
        c = a * b;
        Console.WriteLine("a * b = {0}", c);
   
        c = a / b;
        Console.WriteLine("a / b = {0}", c);
   
        c = a + b;
        Console.WriteLine("a + b = {0}", c);
   
        c = a - b;
        Console.WriteLine("a - b = {0}", c);
   
        c = a % b;
        Console.WriteLine("a % b = {0}", c);
    }
}

Math.Sign

 
using System;
public class MainClass {
    public static void Main() {
        Console.WriteLine("Math.Sign(1) = {0}", Math.Sign(1));
        Console.WriteLine("Math.Sign(-1) = {0}", Math.Sign(-1));
        Console.WriteLine("Math.Sign(0) = {0}", Math.Sign(0));
    }
}

Use Math.Round

 
using System;
public class MainClass {
    public static void Main() {
        Console.WriteLine(Math.Round(4.4));
        Console.WriteLine(Math.Round(4.5));
        Console.WriteLine(Math.Round(4.6));
        Console.WriteLine(Math.Round(5.5));
        Console.WriteLine(Math.Round(4.54, 1));
        Console.WriteLine(Math.Round(4.55, 1));
        Console.WriteLine(Math.Round(4.65, 1));
        Console.WriteLine(Math.Round(4.56, 1));
    }
}