C++ Exercises: Display the pattern like right angle triangle with number

Last update on April 07 2025 13:01:21 (UTC/GMT +8 hours)

36. Display Right-Angle Triangle Pattern with Numbers

Write a program in C++ to display the pattern like right angle triangle with number.

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

    // Display message asking for input
    cout << "\n\n Display the pattern using number starting from 1:\n";
    cout << "------------------------------------------------------\n";
    cout << " Input number of rows: ";
    cin >> rows; // Read input for the number of rows from the user

    // Loop to print the pattern using numbers starting from 1
    for (i = 1; i <= rows; i++) // Loop for the number of rows
    {
        for (j = 1; j <= i; j++) // Nested loop for printing numbers in each row
        {
            cout << j; // Print the current value of 'j' (numbers starting from 1)
        }
        cout << endl; // Move to the next line after each row is printed
    }
}

Sample Output:

 Display the pattern using number starting from 1:                     
------------------------------------------------------                 
 Input number of rows: 5                                               
1                                                                      
12                                                                     
123                                                                    
1234                                                                   
12345

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C++ program to print a right-angled triangle pattern where each row contains sequential numbers starting from 1.
• Write a C++ program that displays a triangle with numbers incremented on each row using nested loops.
• Write a C++ program to output a numeric triangle pattern where the first row is "1", the second row is "12", and so on.
• Write a C++ program that reads the number of rows and prints a right-angle triangle pattern with concatenated numbers in each row.

C++ Code Editor:

Click to Open Editor

Contribute your code and comments through Disqus.

Previous: Write a program in C++ to display the pattern like right angle triangle using an asterisk.
Next: Write a program in C++ to make such a pattern like right angle triangle using number which will repeat the number for that row.