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

C Programming Language / Loop control in C Language

1489

Program:

/**
 * C program to print mirrored right triangle star pattern series
* atnyla.com
 */

#include <stdio.h>

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

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

    /* Iterate through rows */
    for(i=1; i<=rows; i++)
    {
        /* Print spaces in decreasing order of row */
        for(j=i; j<rows; j++)
        {
            printf(" ");
        }

        /* Print star in increasing order or row */
        for(j=1; j<=i; j++)
        {
            printf("*");
        }

        /* Move to next line */
        printf("\n");
    }
    
    return 0;
}

Output:

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

Explanation:

Required knowledge

Basic C programming, For loop, Nested loop

Logic to print mirrored right triangle star pattern

 

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

 

The above pattern is similar to right triangle star pattern with leading spaces.

Leading spaces in the above pattern are in decreasing order i.e. first row contains n-1 space, second contains n-2 space and so on. Point your mouse cursor over the pattern to count total spaces per row.

Step by step descriptive logic to print mirrored right triangle star pattern.

  1. Input number of rows to print from user. Store it in some variable say rows.
  2. To iterate through rows run an inner 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 with loop structure for(j=i;j<=rows;j++). Inside this loop print single space.
  4. To print stars run another inner loop from 1 to i, with loop structure for(j=1; j<=i; j++).
  5. After printing all columns of a row, move to next line i.e. print new line.

Another way to solve the above program 



 /*
 * C program to print right triangle star pattern series
* atnyla.com
 */

#include <stdio.h>

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

    /* Input number of rows from user */
    printf("Enter value of n: ");
    scanf("%d", &n);

    for(i=1; i <= n; i++)
    {
        /* Print i number of stars */
        for(j=1; j <= n; j++)
        {
            
			if( j >= n+1-i )
			printf("*");
			else
			printf(" ");
        }

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

    return 0;
}

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