c program to implement shell sort

#include <stdio.h> 
 main() 
 { 
      int arr[10]; 
      int i, j, n , flag= 1, gap_size,temp; 
      clrscr(); 
      printf("\n Enter the number of elements in the array: "); 
      scanf ("%d",&n); 
      printf("\n Enter  numbers: "); 
        for(i= 0;i< n;i++) 
        { 
             scanf("%d",&arr[i]); 
        } 
           while(flag == 1 || gap_size>1) 
           { 
              flag=0; 
              gap_size=(gap_size+1)/2; 
                     for(i=0;i<(n-gap_size);i++) 
                     { 
                              if(arr[i+gap_size]>arr[i]) 
                               { 
                                    temp = arr[i+gap_size]; 
                                    arr[i+gap_size]=arr[i]; 
                                    arr[i] = temp; 
                               } 
                     } 
          } 
              printf("\n The sorted array is: \n"); 
    for(i=0;i<n;i++) 
     { 
           printf ("\t%d\t", arr [i]); 
     } 
           getch(); 
 }