C program to print hollow right triangle star pattern

Write a C program to print hollow right triangle star pattern series using for loop. How to print hollow right triangle star pattern series of n rows using for loop in C programming. Logic to print hollow right triangle star pattern series in C programming.

Input rows: 5

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Required knowledge

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

Must know – Program to print hollow square star pattern.

Logic to print hollow right triangle star pattern

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Logic to print a hollow right triangle is almost similar to right triangle star pattern logic. Just with this pattern you need to print stars only for first and last column or row.

Step by step descriptive logic to print hollow 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 iterate through columns, run an inner loop from 1 to i. The loop structure should look like for(j=1; j<=i; j++).
4. Inside inner loop print star for first or last column or last row otherwise print space.
5. After printing all columns of a row, move to next line i.e. print new line.

Program to print hollow right triangle star pattern

/**
 * C program to print hollow right triangle star pattern
 */

#include <stdio.h>

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

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

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

        printf("\n");
    }

    return 0;
}

Enter number of rows: 5
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Happy coding 😉