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QuestPond’s Interview Questions & Answers on programming algorithm in .NET

How does selection sort algorithm works?

Selection sort is the most simples sorting algorithm.  It finds the lowest value from the collection and moves it to the left. This is repeated until the complete collection is sorted.

Below is a pictorial representation of how selection sort works. We have simple collection down below which has 5, 7, 1, and 0 values.

Step 1: - Find the smallest value from the collection. In the current collection the smallest value is “0”. Move this smallest value to the left hand side.

Step 2: - Iterate again to find the next smallest value. The next smallest value is “1”. Move this value to the left hand side before the first smallest value.

In this manner continue with all elements in a collection and your list is sorted.

Below is a simple C# code for selection algorithm.

// array of integers to hold values
privatestaticint[] a = newint[4]{2,8,0,3};

staticvoid Main(string[] args)
        {
            Sort();
foreach (int temp in a)
            {
Console.WriteLine(temp);
            }
Console.ReadLine();
        }


publicstaticvoid Sort()
        {
int i, j;
int min, temp;

for (i = 0; i < a.Count() - 1; i++) // Loop through each element
            {
                min = i; // Assume that he is the smallest

for (j = i + 1; j < a.Count(); j++) // Loop through the remaining element
                {
if (a[j] < a[min]) // If the current value smaller than the min
                    {
                        min = j; // Swap the values
                    }
                }

                temp = a[i]; // Store the current value in temp variuable
                a[i] = a[min]; // Swap the minimum  value to the current position
                a[min] = temp; // Swap the current value to the minimum value position
            }
        }

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Author:
Shivprasad koirala Koirala
I am a Microsoft MVP for ASP/ASP.NET and currently a CEO of a small E-learning company in India. We are very much active in making training videos , writing books and corporate trainings. Do visit my site http://www.questpond.com for .NET, C# , design pattern , WCF , Silverlight , LINQ , ASP.NET , ADO.NET , Sharepoint , UML , SQL Server training and Interview questions and answers
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