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C program to print hollow inverted pyramid star pattern 
*********
 *     *
  *   *
   * *
    *

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💻 Practical Program
📘 Step Learning
Write a C program print hollow inverted pyramid star pattern series of n rows using for loop. How to print hollow inverted equilateral triangle star pattern series of n rows in C program. Logic to print hollow inverted pyramid star pattern in C programming.
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💻 Program Code

/**
 * C program to print hollow inverted pyramid star pattern
* atnyla.com
 */

#include <stdio.h>

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

    /* Input rows to print from user */
    printf("Enter number of rows: ");
    scanf("%d", &rows);

    /* Iterate through rows */
    for(i=1; i<=rows; i++)
    {
        /* Print leading spaces */
        for(j=1; j<i; j++)
        {
            printf(" ");
        }

        /* Print hollow pyramid */
        for(j=1; j<=(rows*2 - (2*i-1)); j++)
        {
            /*
             * Print star for first row(i==1),
             * ith column (j==1) and for
             * last column (rows*2-(2*i-1))
             */ 
            if(i==1 || j==1 || j==(rows*2 - (2*i - 1)))
            {
                printf("*");
            }
            else
            {
                printf(" ");
            }
        }

        /* Move to next line */
        printf("\n");
    }

    return 0;
}

🖥 Program Output

Enter number of rows: 5
*********
 *     *
  *   *
   * *
    *

📘 Explanation

Required knowledge

Basic C programming, If else, For loop, Nested loop

Must know - Program to print hollow pyramid pattern.

Logic to print hollow inverted pyramid star pattern

 

*********
 *     *
  *   *
   * *
    *

 

The above pattern is similar to inverted pyramid star pattern except spaces are printed in center of the pyramid.

Step by step descriptive logic to print hollow pyramid star pattern.

  1. Input number of rows to print from user. Store it in a variable say rows.
  2. To iterate through rows, run an outer loop from 1 to rows. The loop structure should look like for(i=1; i<=rows; i++).
  3. To print leading spaces, run an inner loop from 1 to i - 1. The loop structure should look like for(j=1; j. Inside this loop print single space.
  4. To print stars, run another inner loop from 1 to rows * 2 - (i * 2 - 1). The loop structure should look like for(j=1; j<=(rows*2-(i*2-1)); j++).

    Inside this loop print star for ith and last column and for first row otherwise print space.

  5. After printing all columns of a row, move to next line i.e. print new line.
← Previous C Program - Write a program to find the factorial of a number using for loop
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Rewrite the program without looking at the code. Modify values, conditions or logic and run it again. This helps improve confidence and strengthens coding skills much faster.

📌 Topic Information
Subject C Programming Language
Chapter Loop control in C Language
Sub-Chapter For Loop in C Language

⚡ Quick Practice Flow

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  • Read the topic carefully
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