C++ Exercises: Display the pattern like right angle triangle with right justified using digits

Last update on April 07 2025 12:59:27 (UTC/GMT +8 hours)

53. Right-Angle Triangle with Right-Justified Numbers

Write a C++ program to display the pattern like right angle triangle with right justified digits.

Visual Presentation:

Sample Solution:

C++ Code :

#include <iostream> // Include the input/output stream library
using namespace std; // Using standard namespace

int main() // Main function where the execution of the program starts
{
    int i, j, rows, d; // Declare integer variables i, j, rows, and d

    // Display message asking for input
    cout << "\n\n Display the pattern like right angle triangle with right justified using digits:\n";
    cout << "-------------------------------------------------------------------------------------\n";
    cout << " Input number of rows: ";
    cin >> rows; // Read input for the number of rows from the user

    for (i = 1; i <= rows; i++) // Loop for the number of rows
    {
        for (j = 1; j <= rows - i; j++) // Loop to print spaces before the digits
        {
            cout << " "; // Print a space for formatting
        }

        d = i; // Assign the value of 'i' to 'd'

        for (j = 1; j <= i; j++) // Loop to print digits in descending order
        {
            cout << d; // Print the value of 'd'
            d--; // Decrement 'd' for the next digit
        }

        cout << endl; // Move to the next line after each row is printed
    }
}

Sample Output:

 Display the pattern like right angle triangle with right justified using digits:                                                             
-------------------------------------------------------------------------------------                                                         
 Input number of rows: 5                                               
    1                                                                  
   21                                                                  
  321                                                                  
 4321                                                                  
54321

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C++ program to print a right-angle triangle of numbers that is right justified, with each row displaying a reverse sequence from the row number to 1.
• Write a C++ program that reads n and prints a triangle pattern where each row's numbers are aligned to the right margin.
• Write a C++ program to generate a right-angled triangle where numbers are printed in descending order on each row and right aligned using spaces.
• Write a C++ program to output a right-justified triangle pattern with each row containing numbers counting down from the row index.

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