Shell Sort in C

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SHELL SORT>>
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#include<stdio.h>
#include<conio.h>
void shellsort(int a[],int n)
{
int m,i,j,mid;
for(m=n/2;m>0;m/=2)
{  for(j=m;j<n;j++)
 {  for(i=j-m;i>=0;i-=m)
 {
 if(a[i+m]>=a[i])
break;
 else
 {
mid=a[i];
a[i]=a[i+m];
a[i+m]=mid;
}
}}     }      }

void main()
{
int a[100],n,i;
clrscr();
printf("Enter the number of elements=\t");
scanf("%d",&n);
printf("Enter %d elements one by one:>>\n",n);
for(i=0;i<n;i++)
scanf("%d",&a[i]);
printf("Array before sorting>>\n");
for(i=0;i<n;i++)
printf("[%d]\n",a[i]);
shellsort(a,n);

printf("Array after  sorting>>\n");
for(i=0;i<n;i++)
printf("[%d]\n",a[i]);

}