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🚀 Programming Example

C program to print hollow pyramid (Equilateral triangle) star pattern 
    *
   * *
  *   *
 *     *
*********

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

/**
 * C program to print hollow pyramid triangle 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);

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

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

Logic to print hollow pyramid star pattern

 

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

 

The above pattern is similar to pyramid star pattern except of center spaces.

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 spaces, run an inner loop from i to rows - 1. The loop structure should look like for(j=i; j. Inside this loop print single space.
  4. To print star, run another inner loop from 1 to i * 2 - 1. The loop structure should look like for(j=1; j<=(i*2-1); j++). Inside this loop print star for ith or last column or for last row.
  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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🎯 How to learn from this example

First understand the algorithm carefully. Then study the program line-by-line and compare it with the output. Finally, review the explanation section to strengthen your logic and programming understanding.

🔥 Practice suggestion

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

Follow this learning sequence for better understanding.

  • Read the topic carefully
  • Understand the algorithm
  • Study the code line-by-line
  • Check the output result
  • Practice by modifying logic

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