C program to print hollow right triangle star pattern

Star Patterns

C Basics C Programming Tutorial Basic C Exercises Bitwise Operator Exercises Conditional Operator Exercises If else Exercises Switch case Exercises Loop Exercises Star Patterns Number Patterns Functions Exercises Array Exercises String Exercises Pointer Exercises File handling Exercises Data Structures

• C Programming Exercises
• Basic C programming exercises
• Bitwise operator exercises
• Conditional operator exercises
• If else exercises
• Switch case exercises
• Loop and iteration exercises
• Star patterns exercises
• Number pattern exercises
• Functions and recursion exercises
• Array and Matrix exercises
• String exercises
• Pointer exercises
• Files handling exercises

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.

Required knowledge

Operators, Data Types in c, Variables in C, Basic input/output, C if-else, C Loops

Logic to print hollow right triangle star pattern

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

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;
}

Output:

Enter number of rows: 5

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

Recommended posts

Loop programming exercises index.
Basic programming exercises index.
If else programming exercises index.
Array programming exercises index.
String programming exercises index.
Pointer programming exercises index.
Star Patterns exercises index.
Number Patterns exercises index.
alphabet Patterns exercises index.
series program exercises index.

Follow @NEWSPAPERS_NEW

C Programming