Insertion sort C++ code

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#include<iostream.h>
#include<conio.h>
void insertion_sort(int a[10],int n)
{
int j,key,i;
for( j=1;j<n;j++)
{
 key=a[j];
 i=j-1;
 while(i>=0&&a[i]>key)
   {
     a[i+1]=a[i];
       i=i-1;
   }
   a[i+1]=key;
}
}
void main()
{

 int a[20],n;

 cout<<"enter the size of array\n";
 cin>>n;
 cout<<"enter the elements\n";
 for(int i=0;i<n;i++)
  cin>>a[i];

  insertion_sort(a,n);

 cout<<"sorted array is\n";
  for(int i=0;i<n;i++)
    cout<<a[i]<<",";
   getch();
 }