⓲C Program to Print Right Star Triangle

 

Program: Right Star Triangle

#include <stdio.h>

int main()
{
    int i, j;

    // Outer loop controls the number of rows
    for(i = 1; i <= 5; i++)
    {
        // Inner loop prints stars in each row
        for(j = 1; j <= i; j++)
        {
            printf("* ");
        }

        // Move to next line after each row
        printf("\n");
    }

    return 0;
}

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Output

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

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Explanation

1️⃣ Header File

#include <stdio.h>

This line allows us to use printf() for printing output.

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2️⃣ Main Function

int main()

The program execution starts from the main() function.

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3️⃣ Variable Declaration

int i, j;

• i → controls rows

• j → controls number of stars in each row

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4️⃣ Outer Loop (Rows)

for(i = 1; i <= 5; i++)

This loop decides how many rows will print.

i value	Row
1	Row 1
2	Row 2
3	Row 3
4	Row 4
5	Row 5

---

5️⃣ Inner Loop (Stars)

for(j = 1; j <= i; j++)

This loop prints stars in each row.

Row (i)	Stars Printed
1	*
2	* *
3	* * *
4	* * * *
5	* * * * *

Because j runs until i, the stars increase each row.

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6️⃣ New Line

printf("\n");

After printing stars in one row, this moves the cursor to the next line.

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Simple Logic

Row 1 → 1 star
Row 2 → 2 stars
Row 3 → 3 stars
Row 4 → 4 stars
Row 5 → 5 stars

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✅ Tip for exams:
Remember this rule for right triangle patterns:

Inner loop limit = row number

✅ Next Program: Printing a Reverse Triangle Star Pattern in C using loop