int a[8]={2,3,4,5,6,2,3,1};
for (int i=1;i<8;i++)
{
  int key = a[i];
  int j=i-1;
  while(a[j]>key && j>=0)
  {
   ________;
   j -= 1;
  }
  a[j + 1]= key;
}