Half Diamond Star Pattern

#include <stdio.h>

int
main ()
{
  int n, m = 1;
  printf ("Enter the number of columns");
  scanf ("%d", &n);
  for (int i = 1; i <= n; i++)
    {
      for (int j = 1; j <= i; j++)
	{
	  printf ("*");
	}
      printf ("\n");
    }
  for (int i = n - 1; i >= 1; i--)
    {
      for (int j = 1; j <= i; j++)
	{
	  printf ("*");
	}
      printf ("\n");
    }

  return 0;
}

Enter the number of columns
10
*
**
***
****
*****
******
*******
********
*********
**********
*********
********
*******
******
*****
****
***
**
*