interview questions ? programming ..

Question

Hi

Q 1) Create classes that will clearly represents fallowing constructs .

*Define a shape object ,where the object is any two dimensional figure , and has fallowing characteristics Name , perimeter ,surface area

* Define circle , retaining and accurately outputting the values of the aforementioned characteristics of a shape

*Define a triangle , this time , the name of the triangle should be taken into account if it is equilateral (3 sides equal) , isosceles (only 2 sides same) , scalene (no side is equal in lengths )

Q 2 ) Choose you are designing spell check application to be used in any editor like Word , Textpad etc . The dictionary used in the memory to ensure quick spell check by the spell check application . WHICH DATA STRUCTURE WILL YOU USE in this dictionary ?WHY justify your view .

Q 3 ) Simple one Http-get vs Http-Post ... i know this thing but they asked difference b/w
hhtp-get , post , HEAD methods . any ideAS ....

Ty for you help
Have a nice day

Vulpes · Answer

Q 1) using System; public abstract class Shape { public abstract string Name { get; } public abstract double Perimeter { get; } public abstract double SurfaceArea { get; } } public class Circle : Shape { private double _radius; public override string Name { get { return Circle; } } public override double Perimeter { get {return 2.0 * Math.PI * _radius; }} public override double SurfaceArea { get {return Math.PI * _radius * _radius; }} public Circle(double radius) { _radius = radius; } } public class Triangle : Shape { private double _side1 _side2 _side3; private string _name; public override string Name { get { return _name; } } public override double Perimeter { get {return _side1 + _side2 + _side3; }} public override double SurfaceArea { get { // Heron's formula double s = (_side1 + _side2 + _side3)/ 2.0; return Math.Sqrt(s * (s - _side1) * (s - _side2) * (s - _side3)); } } public Triangle(double side1 double side2 double side3) { _side1 = side1; _side2 = side2; _side3 = side3; if((side1 == side2) && (side2 == side3)) _name = Equilateral Triangle; else if ((side1 == side2) || (side1 == side3) || (side2 == side3)) _name = Isosceles Triangle; else _name = Scalene Triangle; } } class Test { static void Main() { var c = new Circle(1); Console.WriteLine(c.Name); Console.WriteLine(c.Perimeter); Console.WriteLine(c.SurfaceArea); Console.WriteLine(); var t = new Triangle(1 1 1); Console.WriteLine(t.Name); Console.WriteLine(t.Perimeter); Console.WriteLine(t.SurfaceArea); Console.ReadKey(); } } Output: Circle 6.28318530717959 3.14159265358979 Equilateral Triangle 3 0.433012701892219 Q 2) A BK-Tree is a good data structure to use for spell checking as it enables fast approximate string matching. Q 3) With HTTP GET the user input is transmitted as a query string appended to the URL. With HTTP POST the user input is transmitted within the body of the HTTP request.

Vulpes · Answer

The HEAD command is similar to GET as far as the HTTP request is concerned. However the HTTP response only contains the header - the body is excluded. Incidentally with the POST command I should have said that you can optionally append the user input to the URL as you must do with the GET command. The Shape class needs to be able to accommodate ANY two dimensional figure : triangle rectangle pentagon circle ellipse or any other regular or irregular figures. All these figures have in common is that they have a perimeter and a surface area even though these will be calculated differently for each figure. So Shape is a classic example of an abstract class and the other shapes I've mentioned are concrete classes which derive from Shape and provide the appropriate implementation of the Perimeter and SurfaceArea properties. It's best for these to be defined as properties rather than methods so that you don't have to keep passing the sides radius etc as parameters. Instead these can be saved as fields when the concrete class is instantiated.

SUNIL GUTTA · Answer

Hi I tried like this below . any suggestions how to approach things .. My code suckz right class shape { public string c_name(string n) { return n; } public string t_name(double s1 double s2 double s3) { if (s1 == s2 && s2 == s3) { return equilateral Triangle; } else if (s1 != s2 && s2 != s3) { return scalene Triangle; } else { return iscocelus Triangle ; } } public double c_perimeter(double r) { return 2 * 3.14 * r; } public double c_surfacearea(double r) { return 3.14 * r * r; } public double t_perimeter(double s1 double s2 double s3) { return s1 + s2 + s3; } public double t_surfacearea(double s1 double s2 double s3) { return 0.5*s1*s2; } } public class circle { static void Main() { shape s = new shape(); Console.WriteLine(The {0} has Permeter {1} and surface area {2} s.c_name(circle)s.c_perimeter(4)s.c_surfacearea(4)); Console.ReadKey(); } } Thank you

SUNIL GUTTA · Answer

perfect .!! ' But what about HEAD method ?? any ideas ...