Shell Sort in C++

A program to demonstrate shell sort algorithm using a C++ programming language.

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Program Listing


#include <iostream> 

using namespace std; 

void Shell_Sorting(int arr[], int n)
{
	for(int gap=n/2;gap>0;gap /= 2)
	{
		for(int j = gap;j<n;j+=1)
		{
			int temp = arr[j];
			int i=0;
			
			for(i=j;(i>=gap)&&(arr[i-gap]>temp);i-=gap)
			{
				arr[i] = arr[i-gap];
			}
			arr[i] = temp;
		}
	}
}

int main() 
{ 
	int n=0;
	
	cout << endl << endl;
	cout << "\tShell Sort in C++";
	cout << endl << endl;
	cout<<"\tHow Many Items? : ";
	cin>>n;
	int arr1[n],arr2[n];
	
	
	cout << endl << endl;
	
	for(int i=0;i<n;i++)
	{
		cout<<"\tEnter value in item no. "<<i+1<< ": ";
		cin>>arr1[i];
		arr2[i]=arr1[i];
	}
	
	cout << endl << endl;
	cout<<endl<<"\tBefore Sorting of Numbers: "<<endl;
	cout<< endl;
	for(int i=0;i<n;i++)
	{
		cout<<"\t" <<arr1[i]<<" ";
	}
		
	cout<<endl<<endl;
	
	Shell_Sorting(arr1, n); 
   
	cout<<endl<<"\tAfter Sorting of Numbers: "<<endl;
	cout<< endl;
	for(int i=0;i<n;i++)
	{
		cout<<"\t"<<arr1[i]<<" ";
	}
	cout << endl<< endl;
	cout << "\tEnd of Program";
	cout << endl;
   return 0; 
}