Simple loop
===========
public class Main {

	public static void main(String[] args) {
		int i = 10;
		while (i > 0)
			i--;
		System.out.println(i);
	}
}


Test the Day class
==================
public class Day {
    private int year;
    private int month;
    private int day;

    public Day(int y, int m, int d) {
        year = y;
        month = m;
        day = d;
    }

    public String toString() {
        return day + "-" + month + "-" + year;
    }
}

public class Main {

    public static void main(String[] args) {
        Day d = new Day(2025, 9, 3);
        System.out.println(d);
    }
}


Constructor 1 OK?
==================
	public Day(int y, int m, int d) {
		year = y;
		month = m;
		day = d;
	}

Constructor 2 OK?
==================
	public Day(int y, int m, int d) {
		int year = y;
		int month = m;
		int day = d;
	}

Constructor 3 OK?
==================
	public Day(int y, int m, int d) {
		y = year;
		m = month;
		d = day;
	}



Compilation errors
==================

public class Main {

//	public static void main(String[] args) {
//		int sum = 0;
//
//		for (int i=0; i<10; i++)
//		   sum = sum + i;
//
//		System.out.println(sum);
//		System.out.println(i);
//
//
//	}
//	
//	int m(int i) {
//		return i*2;
//		i++;
//	}
//
//	int larger(int i, int j) 
//	{
//			if (i>j) return i;
//			if (i<=j) return j;
//	}

}

0.899999999
===========
	public static void main(String[] args) {
		System.out.println(2.0-1.1); //output 0.8999999999999999
	}


casting
=======

public static void main(String [] args) 
{	
		int i=97; char c;
		c=(char)i; 
		System.out.println(i); //output: 97
		System.out.println(c); //output: a
}	


Ability Test //Can try on https://repl.it/languages/cpp
============
#include <iostream>
using namespace std;

____ search_section (const int values[ ]____________________) {


  while (________) {


  }


}

int main() {
	const int arr[ ]={1,3,5,7,9,2,4,7,8,7};
	cout << "Within arr[2..8], the value 7 occurs: ";
	cout << search_section(arr, 2, 8, 7);
	cout << " times"; 
	return 0;
}


fibo
=====
public class Main
{
	public static int f(int n)
	{
		System.out.println(n);
		if (n == 0 || n == 1)
			return 1;
		else
			return f(n-1) + f(n-2);
	}
		
	public static void main(String[] args) 
	{
		System.out.println(

			"Final result: "+f(5));
	}

}