Some Little Questions

If it's a console application, I can give you a solution to the first question as I coded something very similar a while back :

using System;

using System.IO;

using System.Collections.Generic;

class Employee

{

public string Name { get; set; }

public Employee(string name)

{

Name = name;

}

class EmployeeComparer : IComparer

{

// Compares by Name, ascending, case insensitive

public int Compare(Employee e1, Employee e2)

{

return String.Compare(e1.Name, e2.Name, true);

}

class Program

{

static Employee[] employees;

static EmployeeComparer comparer;

static void Main()

{

employees = new Employee[0]; // no employees initially

comparer = new EmployeeComparer();

InsertEmployee(new Employee("John"));

InsertEmployee(new Employee("David"));

InsertEmployee(new Employee("Fred"));

InsertEmployee(new Employee("Bill"));

int index = SearchEmployee("David");

int index2 = SearchEmployee("Jack");

DeleteEmployee("Bill");

InsertEmployee(new Employee("Zack"));

DeleteEmployee("Sam");

// iterate the remaining employees

Console.WriteLine("\nThe current employeees in sorted order are\n");

foreach(Employee e in employees) Console.WriteLine(e.Name);

Console.ReadKey();

}

static void InsertEmployee(Employee employee)

{

Array.Resize(ref employees, employees.Length + 1);

employees[employees.Length - 1] = employee;

Array.Sort(employees, comparer);

Console.WriteLine("An employee called {0} has been inserted", employee.Name);

}

static void DeleteEmployee(string name)

{

int index = -1;

string temp = name.ToLower(); // ignore case

for(int i = 0; i < employees.Length; i++)

{

if (employees[i].Name.ToLower() == temp)

{

index = i;

break;

}

if (index == -1)

{

Console.WriteLine("An employee called {0} does not exist", name);

return;

}

employees[index].Name = "Zzzzz"; // this will now sort last

Array.Sort(employees, comparer);

Array.Resize(ref employees, employees.Length - 1); // remove last element

Console.WriteLine("An employee called {0} has been deleted", name);

}

static int SearchEmployee(string name)

{

int index = -1;

string temp = name.ToLower(); // ignore case

for(int i = 0; i < employees.Length; i++)

{

if (employees[i].Name.ToLower() == temp)

{

index = i;

break;

}

if (index == -1)

{

Console.WriteLine("An employee called {0} does not exist", name);

}

else

{

Console.WriteLine("An employee called {0} has been found at index {1}", name, index);

}

return index;

}

The second question is non-trivial as you need to understand the mathematics of not just one but six possible color format conversions. To figure that out, code it and thoroughly test it is going to take anyone who's not an expert in that area several hours.

If you don't know them already, I suggest you google for the mathematical bases of the conversions (I'd start with Wikipedia) and then try and code them from there.

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes14y ago
Accepted answer
If it's a console application, I can give you a solution to the first question as I coded something very similar a while back :

using System;
using System.IO;
using System.Collections.Generic;

class Employee
{
public string Name { get; set; }

public Employee(string name)
{
Name = name;
}
}

class EmployeeComparer : IComparer
{
// Compares by Name, ascending, case insensitive
public int Compare(Employee e1, Employee e2)
{
return String.Compare(e1.Name, e2.Name, true);
}
}

class Program
{
static Employee[] employees;
static EmployeeComparer comparer;

static void Main()
{
employees = new Employee[0]; // no employees initially
comparer = new EmployeeComparer();

InsertEmployee(new Employee("John"));
InsertEmployee(new Employee("David"));
InsertEmployee(new Employee("Fred"));
InsertEmployee(new Employee("Bill"));
int index = SearchEmployee("David");
int index2 = SearchEmployee("Jack");
DeleteEmployee("Bill");
InsertEmployee(new Employee("Zack"));
DeleteEmployee("Sam");

// iterate the remaining employees
Console.WriteLine("\nThe current employeees in sorted order are\n");
foreach(Employee e in employees) Console.WriteLine(e.Name);
Console.ReadKey();
}

static void InsertEmployee(Employee employee)
{
Array.Resize(ref employees, employees.Length + 1);
employees[employees.Length - 1] = employee;
Array.Sort(employees, comparer);
Console.WriteLine("An employee called {0} has been inserted", employee.Name);
}

static void DeleteEmployee(string name)
{
int index = -1;
string temp = name.ToLower(); // ignore case

for(int i = 0; i < employees.Length; i++)
{
if (employees[i].Name.ToLower() == temp)
{
index = i;
break;
}
}

if (index == -1)
{
Console.WriteLine("An employee called {0} does not exist", name);
return;
}

employees[index].Name = "Zzzzz"; // this will now sort last
Array.Sort(employees, comparer);
Array.Resize(ref employees, employees.Length - 1); // remove last element
Console.WriteLine("An employee called {0} has been deleted", name);
}

static int SearchEmployee(string name)
{
int index = -1;
string temp = name.ToLower(); // ignore case
for(int i = 0; i < employees.Length; i++)
{
if (employees[i].Name.ToLower() == temp)
{
index = i;
break;
}
}

if (index == -1)
{
Console.WriteLine("An employee called {0} does not exist", name);
}
else
{
Console.WriteLine("An employee called {0} has been found at index {1}", name, index);
}

return index;
}
}

The second question is non-trivial as you need to understand the mathematics of not just one but six possible color format conversions. To figure that out, code it and thoroughly test it is going to take anyone who's not an expert in that area several hours.

If you don't know them already, I suggest you google for the mathematical bases of the conversions (I'd start with Wikipedia) and then try and code them from there.
Satyapriya Nayak14y ago
Hi Taklaci,

This is a windows application,web application or console application?

Have you started in doing some code of this application.

Thanks