C Program to print Hourglass Star Pattern

  C Program Pattern

 Program to print Hourglass Pattern
Example

#include <stdio.h>

 

int main()

{

  int i, j, k, rows;

 

  printf("Enter the no. of rows: ");

  scanf("%d", &rows);

 

  printf("Output: \n\n");

 

  for (i = 1; i <= rows; i++)

  {

    for (k = 1; k < i; k++)

      printf(" ");

 

    for (j = i; j <= rows; j++)

      printf("* ");

 

    printf("\n");

  }

 

  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;

}

C Program to Print Hollow Square  Star Pattern
Explain Program

Step :1

#include <stdio.h>

 standard input/output library to use functions like printf() and scanf().

Step :2

int main()

{

  int n, a, k;

Declares three integer variables:

n: number of rows for the top half of the diamond.

 k: used for looping through rows.

 a: used for spaces and asterisks within each row.

Step :3

  printf("Enter number of rows\n");

  scanf("%d", &n);

input the number of rows determines the size of the diamond

Step :4

  for (k = 1; k <= n; k++)

  {

    for (a = 1; a <= n-k; a++)

      printf(" ");

 

    for (a = 1; a <= 2*k-1; a++)

      printf("*");

 

    printf("\n");

  }

 loop prints the top half of the diamond.

Spaces: n - k spaces before stars

 Stars: 2 * k - 1 stars

 k from 1 to n row has 2 * n - 1 stars. 

Step :5

Bottom Half of the Diamond 

  for (k = 1; k <= n - 1; k++)

  {

    for (a = 1; a <= k; a++)

      printf(" ");

 

    for (a = 1 ; a <= 2*(n-k)-1; a++)

      printf("*");

 

    printf("\n");

  }

This loop print the bottom half of the diamond.

  Spaces: k spaces.

 Star 2 * (n - k) - 1 stars

 loop  from k = 1 to n - 1 because the middle line 

Step :6

  return 0;

}

Ends the program.

C Program to print Hourglass Pattern
Output 

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