Pattern:

123

1234

Solution

Note: Don't jump directly to the solution, try it out yourself first.

Approach:

1)Require minimum 2 nested loop

2)Outer loop is for row

3)Inner loop is for column

4)Print in inner loop

Explanation:

1)The Pattern has total 4 rows and each row corresponds to the row number (row 1 has 1 star, row 2 has 2 stars, etc.).

2)To print this pattern , we need two loops:

Outer loop for the rows (row = 0 to total_row)

Inner loop for the columns(col = 0 to row).

3)In each iteration of the outer loop, the inner loop (col+1)stars corresponding to the row number.

Video Solution

Java

public class Pattern {

public static void main(String[] args) {

// Number of rows in the pattern

int total_row= 3;

// Outer loop for rows

for (int row = 0; row < total_row; row++) {

// Inner loop for columns

for (int col=0; col<=row ; row++) {

System.out.print(col+1);

}

// Move to the next line

System.out.println();

}

C++

#include <iostream>
using namespace std;

int main() {
    int total_rows = 4;  // number of rows

     // Outer loop for rows
        for (int row = 0; row < total_row; row++) {
            // Inner loop for columns
            for (int col=0; col<=row ; row++) {
                cout<<col+1;
            }
            
        cout << endl;  // Move to the next line after printing a row
    }

    return 0;
}