C Program to print Half Hourglass Star pattern

In this tutorial, we will write a program to print half hourglass pattern in C. Before that, you may go through the following topic in C.

• for loop in C

1. Right half hourglass pattern in C

#include <stdio.h>

int main()
{
  int i, j, rows;

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = rows - 1; i >= 0; i--)
  {
    for (j = i; j >= 0; j--)
    {
      printf("* ");
    }
    printf("\n");
  }

  for (i = 0; i <= rows - 1; i++)
  {
    for (j = i; j >= 0; j--)
    {
      printf("* ");
    }
    printf("\n");
  }

  return 0;
}

Enter the no. of rows: 5
* * * * *
* * * *
* * *
* *
*
*
* *
* * *
* * * *
* * * * *

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2. Left half hourglass pattern in C

#include <stdio.h>

int main()
{
  int i, j, k, rows;

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  printf("Output: \n\n");
  //upper half
  for (i = 1; i <= rows; i++)
  {
    for (k = 1; k < i; k++)
      printf(" ");

    for (j = i; j <= rows; j++)
      printf("*");

    printf("\n");
  }

  //lower half
  for (i = rows - 1; i >= 1; i--)
  {
    for (k = 1; k < i; k++)
      printf(" ");

    for (j = i; j <= rows; j++)
      printf("*");

    printf("\n");
  }

  return 0;
}

Output:

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