Print a Triangle of Asterisks: Nested Loops Exercise

Print a Triangle of Asterisks in C++

In this exercise, you will write a C++ program that prints a triangle pattern using asterisks (*). This is a common exercise used to practice loops and nested loops. The pattern will consist of a series of rows, with each row containing an increasing number of asterisks.

Iterative Logic

1. Outer Loop

This loop manages the rows of the triangle. It runs from 1 up to the total number of rows entered by the user.

2. Inner Loop

A nested loop that prints asterisks. The number of asterisks printed depends on the current row index ($j \leq i$).

3. New Line Logic

After the inner loop finishes printing stars for a row, endl is used to move the cursor to the next line.

Objective

  • 1. Use a loop to iterate through the rows of the triangle.
  • 2. For each row, use a nested loop to print the appropriate number of asterisks.
  • 3. Test the program with different numbers of rows to ensure it works correctly.

Example C++ Exercise

triangle_pattern.cpp Nested Loops 
#include <iostream> // Include the iostream library for input and output

using namespace std; // Use the standard namespace

// Main function - the entry point of the program
int main() {
    int rows; // Variable to store the number of rows for the triangle

    // Ask the user to enter the number of rows for the triangle
    cout << "Enter the number of rows for the triangle: ";
    cin >> rows; // Read the user input and store it in the variable rows

    // Outer loop to handle the number of rows
    for (int i = 1; i <= rows; ++i) {
        // Inner loop to print the asterisks for each row
        for (int j = 1; j <= i; ++j) {
            cout << "*"; // Print an asterisk for the current position
        }
        cout << endl; // Move to the next line after printing all asterisks for this row
    }

    return 0; // Return 0 to indicate that the program executed successfully
}

Console Output:

Enter the number of rows for the triangle: 5
*
**
***
****
*****
Flow Control & Loops
Print a Triangle of Asterisks in C++ Nested Loop Patterns and Iterative Logic in C++ Console Character Formatting and Row Management Basic C++ Pattern Exercises and Algorithm Design

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