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🚀 Programming Example

C program to print Equilateral triangle (Pyramid) star pattern 
    *
   ***
  *****
 *******
*********

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

/**
 * C program to print equilateral triangle or pyramid star pattern
* atnyla.com 
*/

#include <stdio.h>

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

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

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

        /* Print star */
        for(j=1; j<=(2*i-1); j++)
        {
            printf("*");
        }

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

    return 0;
}

🖥 Program Output

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

📘 Explanation

Required knowledge

Basic C programming, For loop, Nested loop

Logic to print pyramid star pattern

 

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

 

Before you read further have a close look at the above pattern. The pattern consists of N (for this case 5) rows. Each row contain exactly 2 * N - 1 stars. In addition to stars the pattern has leading spaces. Each row contain N - i spaces (where i is current row number). To count total spaces per row point your mouse over the above pattern.

Step by step descriptive logic to print 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.

    Note: Iterating from 1 to N - i or i to rows - 1 both are equal.

  4. To print star, run another inner loop from 1 to 2 * i - 1. The loop structure should look like for(j=1; j<=(2*i - 1); j++). Inside this loop print star.
  5. After printing stars for current 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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