C++ Exercises: Display such a pattern for n number of rows using number

Last update on August 14 2025 12:55:22 (UTC/GMT +8 hours)

47. Number Pyramid with 1 at Ends and Row Number in Middle

Write a program in C++ to display such a pattern for n number of rows using numbers. Odd numbers will appear in each row. The first and last number of each row will be 1 and the middle column will be the row number.

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, n; // Declare integer variables i, j, and n

    // Display message asking for input
    cout << "\n\n Display a pattern using odd number of numbers, the first and last number of each row is 1:\n";
    cout << "-----------------------------------------------------------------------------------------------\n";
    cout << " Input number of rows: ";
    cin >> n; // Read input for the number of rows from the user

    for (i = 0; i <= n; i++) // Loop for the number of rows
    {
        /* print blank spaces */
        for (j = 1; j <= n - i; j++) // Loop to print spaces before the numbers
            cout << " "; // Print a space

        /* Display numbers in ascending order up to the middle */
        for (j = 1; j <= i; j++) // Loop to print numbers in ascending order
            cout << j; // Print the number

        /* Display numbers in reverse order after the middle */
        for (j = i - 1; j >= 1; j--) // Loop to print numbers in reverse order
            cout << j; // Print the number in reverse order

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

Sample Output:

 Display a pattern using odd number of numbers, the first and last number of each row is 1:                                                   
-----------------------------------------------------------------------------------------------                                               
 Input number of rows: 5                                               
                                                                       
    1                                                                  
   121                                                                 
  12321                                                                
 1234321                                                               
123454321

Flowchart:

For more Practice: Solve these Related Problems:

Write a C++ program to print a numeric pyramid where each row starts and ends with 1, and the middle digits form an increasing sequence up to the row number.
Write a C++ program to generate a pyramid pattern in which the first and last numbers of each row are 1, and the central number equals the row number.
Write a C++ program that reads the number of rows and constructs a symmetric pyramid of numbers with 1’s at the boundaries and the row number in the center.
Write a C++ program to display a pyramid where the pattern in each row is 1, 2, …, n, then n-1, …, 1, ensuring the first and last digits are 1.

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