C Program to Print Hollow Sandglass Star Pattern

In this tutorial, i am going to show you how to print hollow sandglass star patterns with the help of for loop and while loop in c programs.

All C Programs to Print Hollow Sandglass Star Pattern

• C Program to Print Hollow Sandglass Star Pattern using For Loop
• C Program to Print Hollow Sandglass Star Pattern using While Loop

C Program to Print Hollow Sandglass Star Pattern using For Loop

#include <stdio.h>
int main()
{
	int rows, i, j, k;
	printf("Enter Hollow Sandglass Star Pattern Rows = ");
	scanf("%d", &rows);
	printf("Printing Hollow Sandglass Star Pattern\n");
	for (i = 1; i <= rows; i++)
	{
		for (j = 1; j < i; j++)
		{
			printf(" ");
		}
		for (k = i; k <= rows; k++)
		{
			if (i == 1 || k == i || k == rows)
			{
				printf("* ");
			}
			else
			{
				printf("  ");
			}
		}
		printf("\n");
	}
	for (i = rows - 1; i >= 1; i--)
	{
		for (j = 1; j < i; j++)
		{
			printf(" ");
		}
		for (k = i; k <= rows; k++)
		{
			if (i == 1 || k == i || k == rows)
			{
				printf("* ");
			}
			else
			{
				printf("  ");
			}
		}
		printf("\n");
	}
}

The result of the above c program; as follow:

Enter Hollow Sandglass Star Pattern Rows = 8
Printing Hollow Sandglass Star Pattern
* * * * * * * * 
 *           * 
  *         * 
   *       * 
    *     * 
     *   * 
      * * 
       * 
      * * 
     *   * 
    *     * 
   *       * 
  *         * 
 *           * 
* * * * * * * * 

C Program to Print Hollow Sandglass Star Pattern using While Loop

#include <stdio.h>
int main()
{
	int rows, i, j, k;
	printf("Enter Hollow Sandglass Star Pattern Rows = ");
	scanf("%d", &rows);
	printf("Printing Hollow Sandglass Star Pattern\n");
	i = 1;
	while (i <= rows)
	{
		j = 1;
		while (j < i)
		{
			printf(" ");
			j++;
		}
		k = i;
		while (k <= rows)
		{
			if (i == 1 || k == i || k == rows)
			{
				printf("* ");
			}
			else
			{
				printf("  ");
			}
			k++;
		}
		printf("\n");
		i++;
	}
	i = rows - 1;
	while (i >= 1)
	{
		j = 1;
		while (j < i)
		{
			printf(" ");
			j++;
		}
		k = i;
		while (k <= rows)
		{
			if (i == 1 || k == i || k == rows)
			{
				printf("* ");
			}
			else
			{
				printf("  ");
			}
			k++;
		}
		printf("\n");
		i--;
	}
}

The result of the above c program; as follow:

Enter Hollow Sandglass Star Pattern Rows = 8
Printing Hollow Sandglass Star Pattern
* * * * * * * * 
 *           * 
  *         * 
   *       * 
    *     * 
     *   * 
      * * 
       * 
      * * 
     *   * 
    *     * 
   *       * 
  *         * 
 *           * 
* * * * * * * * 

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