C program to print hollow mirrored rhombus, parallelogram star pattern 
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C Programming Language / Loop control in C Language

696

Program:

/**
 * 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<i; 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.

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