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

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``````
#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;
}``````