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🚀 Programming Example

C program to print half diamond star pattern 
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💻 Practical Program
📘 Step Learning
Write a C program to print the half diamond star pattern using for loop. How to print half diamond star pattern structure using for loop in C program. Logic to print half diamond star pattern series in C programming.
← Previous C Program - Write a program to find the factorial of a number using for loop

💻 Program Code

/**
 * C program to print half diamond star pattern series.
* atnyla.com
 */

#include<stdio.h>

int main()
{
    int i, j, N, columns;

    /* Input number of columns from user */
    printf("Enter number of columns:");
    scanf("%d",&N);

    columns=1;

    for(i=1;i  < N*2;i++)
    {
        for(j=1; j <= columns; j++)
        {
            printf("*");
        }

        if(i  <  N)
        {
            /* Increment number of columns per row for upper part */
            columns++;
        }
        else
        {
            /* Decrement number of columns per row for lower part */
            columns--;
        }

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

    return 0;
}

🖥 Program Output

Enter number of columns: 5
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📘 Explanation

Required knowledge

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

Read more -?Program to print mirrored half diamond star pattern

Logic to print half diamond star pattern

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The above pattern consist of?N * 2 - 1rows. For each row columns are in increasing order till?Nth?row. After?Nth?row columns are printed in descending order.

Step by step descriptive logic to print half diamond star pattern.

  1. Input number of columns to print from user. Store it in a variable say?N.
  2. Declare a variable as loop counter for each column, say?columns = 1.
  3. To iterate through rows, run an outer loop from 1 to?N * 2 - 1. The loop structure should look like?for(i=1; i.
  4. To iterate through columns, run an inner loop from 1 to?columns. The loop structure should look like?for(j=1; j<=columns; j++). Inside this loop print star.
  5. After printing all columns of a row, move to next line.
  6. After inner loop check?if(i <= N)?then increment?columns?otherwise decrement by 1.
← 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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