Pattern:
1
23
456
78910
Solution
Note: Don't jump directly to the solution, try it out yourself first.
Pattern Breakdown
The pattern has 4 rows, and each row contains stars (*) in a decreasing number:
Row 0: 3 Space 1 number
Row 1: 2 Space 2 number(2-3)
Row 2: 1 Space 3 number (4-6)
Row 3: 0 Space 4 number(7-10)
Key observation:
The number of spaces decreases with each row, starting from 3 (for row 0) and going down to 0 (for row 3).
The number of digit increases with each row, starting from 1 digit (for row 0) and going up to 4 digits (for row 3).
First Inner Loop (Spaces):
The first inner loop prints the spaces before the number in each row.
The number of spaces in each row is equal to total_rows - row - 1
Second Inner Loop (Stars):
The second inner loop prints the number in each row.(number++).
The number of stars in each row is equal to row + 1
Video Solution
| Java |
public class Main { public static void main(String[] args) { int total_rows = 4; // Number of rows int num = 1; // Starting number for the sequence // Outer loop for rows for (int row = 0; row < total_rows; row++) { // First inner loop for spaces for (int space = 0; space < total_rows - row - 1; space++) { System.out.print(" "); } // Second inner loop for numbers for (int numCount = 0; numCount <= row; numCount++) { System.out.print(num); num++; // Increment the number after printing } System.out.println(); // Move to the next line } } }
|
| C++ |
#include <iostream> using namespace std; int main() { int total_rows = 4; // Number of rows int num = 1; // Starting number for the sequence // Outer loop for rows for (int row = 0; row < total_rows; row++) { // First inner loop for spaces for (int space = 0; space < total_rows - row - 1; space++) { cout << " "; } // Second inner loop for numbers for (int numCount = 0; numCount <= row; numCount++) { cout << num; num++; // Increment the number after printing } cout << endl; // Move to the next line } return 0; } |
| Python |
total_rows = 4 # Number of rows num = 1 # Starting number for the sequence # Outer loop for rows for row in range(total_rows): # First inner loop for spaces for space in range(total_rows - row - 1): print(" ", end="") # Second inner loop for numbers for numCount in range(row + 1): print(num, end="") num += 1 # Increment the number after printing print() # Move to the next line |
