Home / Programs / C program to print hollow mirrored rhombus, parallelogram star pattern ***** * * * * * * *****
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C program to print hollow mirrored rhombus, parallelogram star pattern 
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💻 Practical Program
📘 Step by Step Learning
Write a C program to print hollow mirrored rhombus star pattern series of N rows using for loop. How to print hollow mirrored rhombus or parallelogram star pattern series in C program. Logic to print hollow inverted rhombus or parallelogram star pattern using loop in C programming.

Program Code

/**
 * C program to print hollow mirrored rhombus star pattern series
* atnyla.com
 */

#include <stdio.h>

int main()
{
    int i, j, N;
 
    /* Input number of rows from user */
    printf("Enter number of rows: ");
    scanf("%d", &N);

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

        /* Print hollow rhombus */
        for(j=1; j<=N; j++)
        {
            if(i==1 || i==N  || j==1|| j==N)
                printf("*");
            else
                printf(" ");
        }

        printf("\n");
    }

    return 0;
}

Output

Enter the value of n: 5
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Explanation

Required knowledge

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

Logic to print hollow mirrored rhombus star pattern

 

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Read more - Program to print hollow rhombus star pattern.

The above pattern contains N rows and columns (where N is total rows to print). If you can notice there are exactly i - 1 spaces each row (where i is current row number). To see or count trailing spaces per row you can hover or click on to the above pattern. Also the stars are printed only for first or last row or for first or last column otherwise blank space is printed.

Step by step descriptive logic to print hollow mirrored rhombus star pattern.

  1. Input number of rows to print from user. Store it in a variable say N.
  2. To iterate though rows, run an outer loop from 1 to N. The loop structure should look like for(i=1; i<=N; i++).
  3. To print space, run an inner loop from 1 to i - 1 with loop structure for(j=1; j. Inside this loop print single blank space.
  4. To print star, run another inner loop from 1 to N. The loop structure should look like for(j=1; j<=N; j++). Inside this loop print stars only if i==1 or i==N or j==1 or j==N.
  5. After printing all columns of a row, move to next line i.e. print new line.

How to learn from this program

First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.

Quick Practice Flow

Use this small plan to get the best result from the program example.

  • Read the title and topic first
  • Understand the algorithm carefully
  • Study the code line by line
  • Check the output and compare the logic

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