C program to print hollow mirrored inverted right triangle star pattern 
*****
 *  *
  * *
   **
    *

C Programming Language / Loop control in C Language

1201

Program:

 /**
 * C program to print hollow mirrored inverted right 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 leading spaces */
        for(j=1; j<i; j++)
        {
            printf(" ");
        }

        /* Print hollow inverted right triangle */
        for(j=i; j<=rows; j++)
        {
            /*
             * Print star for ith column(j==i),
             * last column(j==rows) and for
             * first row(i==1).
             */ 
            if(j==i || j==rows || i==1)
            {
                printf("*");
            }
            else
            {
                printf(" ");
            }
        }

        printf("\n");
    }

    return 0;
}

Output:

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

Explanation:

Required knowledge

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

Must know - Program to print hollow inverted right triangle star pattern

Logic to print hollow mirrored inverted right triangle star pattern

 

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

 

The above pattern is similar to inverted mirrored right triangle star pattern. In addition, in this pattern stars are printed only for first or last column and first row.

Step by step descriptive logic to print inverted right triangle 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 leading spaces, run an inner loop from 1 to i - 1. The loop structure should look like for(j=1; j<i; j++). Inside this loop print single space.
  4. To print stars, run another inner loop from i to rows. The loop structure should look like for(j=1; j<=rows; j++). Inside this loop print star for ith or last column or for first row.
  5. After printing all columns of a row, move to next line i.e. print new line.

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