C PROGRAMMING PROGRAM • PATTERN PROGRAMS

Print an Inverted Right-Triangle Pattern

Learn how to print an inverted right-triangle pattern using a clear C program.

IntermediateNested loopsRows and columnsPattern

PROBLEM UNDERSTANDING

Input and expected output

Sample input

Sample output

* * * *
* * *
* *
*

COMPLETE C PROGRAM

Complete C implementation

#include <stdio.h>

int main(void)
{
    int rows;

    printf("Enter number of rows: ");
    scanf("%d", &rows);
    for (int row = rows; row >= 1; row--) {
        for (int column = 1; column <= row; column++) printf("* ");
        printf("\n");
    }
    return 0;
}

CURRENT STEP

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SELECTED LINE

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EXPECTED OUTPUT FOR THE SAMPLE

* * * *
* * *
* *
*

0%Step 0 of 0

PROGRAM EXPLANATION

Algorithm and explanation

Read the required input values.
Start with N stars and decrease the inner-loop limit after every row.
Display the computed result.

Start with N stars and decrease the inner-loop limit after every row.

EFFICIENCY

Time and space complexity

Time complexity

O(n²)

Auxiliary space

O(1)

DEBUGGING CHECKLIST

Common mistakes

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Use the correct format specifier for every variable.

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Initialize variables before using their values.

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Check braces, semicolons and input order carefully.

Try it yourself

Practice: Run the program with the sample input, predict its output, and then test one boundary case of your own.