Hacktoberfest-2022

Panel00.java

@@ -0,0 +1,208 @@
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.*;
+public class Panel00 extends JPanel {
+	Timer t = new Timer(1, new Listener());
+	int ctr = 0;
+	double G = 0.1; //Gravitational Constant
+
+	final int xpos = 280;
+
+	double[] p2d = {280, 200};
+	double[] v2d = {0, 0};
+
+	int points = 0;
+	int lives = 0;
+	int sides = 13;
+
+	double snorm = 400;
+	double sd = 450;
+	double sv = 0;
+	boolean setlock = false;
+	boolean rdown, ldown;
+	double paddle = 130;
+	double rtheta = 0;
+	double ltheta = 0;
+
+	int preset[][] = {
+			{0, 400, 135, 450,1}, //right paddle
+			{135, 450, 270, 400,1}, //left paddle
+			{270, 0, 300, 20, 1}, //first bouncey thingy
+			{291, 0, 291, 500, 1}, //right wall
+			{-1, 0, 270, 0, 1}, //top wall
+			{0, -1, 0, 500, 1} //left wall
+	};
+
+	int[][] balls = {
+			{80, 80, 30, 50},
+			{230, 280, 20, 200},
+			{50, 200, 25, 100},
+			{200, 100, 10, 500}
+	};
+	int lines[][] = new int[100][5];
+
+	public Panel00(){
+		super();
+		t.start();
+		addKeyListener(new Key());
+		setFocusable(true);
+
+		for(int i = 0; i < preset.length; i++){
+			lines[i] = preset[i];
+		}
+
+		int plen = preset.length;
+
+		int ct = 0;
+		for(int k = 0; k < balls.length; k++){
+			int px = balls[k][0], py = balls[k][1], radius = balls[k][2];
+			for(double i = 0; i < 2 * Math.PI; i+= 2 * Math.PI/ sides){
+				ct++;
+				lines[plen + ct][0] = px + (int) (radius * Math.cos(i));
+				lines[plen + ct][1] = py + (int) (radius * Math.sin(i));
+				lines[plen + ct][2] = px + (int) (radius * Math.cos(i - 2 *Math.PI / sides));
+				lines[plen + ct][3] = py + (int) (radius * Math.sin(i - 2 * Math.PI / sides));
+			}
+		}
+
+	}
+
+	private class Listener implements ActionListener {
+		public void actionPerformed(ActionEvent e){
+			repaint();
+		}
+	}
+
+	public void paintComponent(Graphics g){
+		super.paintComponent(g);
+		v2d[1] += G;
+		p2d[1] += v2d[1];
+		p2d[0] += v2d[0];
+
+
+
+		if(p2d[1] > 1000){
+			p2d[0] = 280;
+			p2d[1] = 200;
+			v2d[0] = 0;
+			v2d[1] = 0;
+			lives++;
+		}
+		if(p2d[0] == 280 && p2d[1] > sd){
+			p2d[1] = sd;
+			v2d[1] = Math.min(v2d[1], sv);
+		}
+
+		if(setlock == false){
+			sv *= 0.95; //the dampening coefficient for the springiness
+			sv -= (sd - snorm)/30;
+			sd += sv;
+		}
+		double rc = 0.1;
+		if(rdown){
+			rtheta = Math.max(-0.5, rtheta - rc);
+		}else{
+			rtheta = Math.min(0.5, rtheta + rc);
+		}
+		if(ldown){
+			ltheta = Math.max(-0.5, ltheta - rc);
+		}else{
+			ltheta = Math.min(0.5, ltheta + rc);
+		}
+
+		lines[0][2] = lines[0][0] + (int) (Math.cos(ltheta) * paddle);
+		lines[0][3] = lines[0][1] + (int) (Math.sin(ltheta) * paddle);
+		lines[1][0] = lines[1][2] + (int) (-Math.cos(rtheta) * paddle);
+		lines[1][1] = lines[1][3] + (int) (Math.sin(rtheta) * paddle);
+		int rX = (int) p2d[0];
+		int rY = (int) p2d[1];
+		int r = 10;
+		g.setColor(Color.blue);
+		g.drawArc(rX - r, rY - r, 2 * r, 2 * r, 0, 360);
+		g.setColor(Color.black);
+		for(int i = 0; i < lines.length; i++){
+			int x1 = lines[i][0],
+				y1 = lines[i][1],
+				x2 = lines[i][2];
+			double y2 = lines[i][3] + 0.0001;
+			if(i > preset.length){
+				g.setColor(Color.red);
+			}
+			g.drawLine(x1, y1, x2, (int) Math.round(y2));
+
+			double bmag = Math.sqrt(v2d[0] * v2d[0] + v2d[1] * v2d[1]);
+			double lineslope = ((double)(x2 - x1))/((double)(y2 - y1));
+			double ballslope = v2d[0] / v2d[1];
+			//System.out.println(ballslope + " " + lineslope);
+			//xpos * ballslope + p2d[1] = xpos * lineslope + y1;
+			double binter = p2d[0] - ballslope * p2d[1];
+			double linter = x1 - lineslope * y1;
+
+			double y = (binter - linter)/(lineslope - ballslope);
+			double sx = y * ballslope + binter;
+			//double qx = y * lineslope + linter;
+			double la = Math.atan2(y2 - y1, x2 - x1);
+			double ba = Math.atan2(v2d[1], v2d[0]);
+
+			double da = 2 * la -  ba;
+
+			//System.out.println(sx + " " + y);
+			/*
+			g.drawLine((int)sx, (int)y, (int)p2d[0], (int)p2d[1]); 
+			g.fillRect((int)sx - 2, (int)y - 2, 4, 4);
+			g.drawLine((int)p2d[0], (int)p2d[1], (int) (p2d[0] + Math.cos(da) * 100), (int)(p2d[1] + Math.sin(da) * 100)); 
+			//*/
+			if(sx >= Math.min(x2, x1) && sx <= Math.max(x1, x2) && 
+			   Math.min(y1, y2) <= y && Math.max(y1, y2) >= y){
+				double interdist = Math.sqrt(Math.pow(sx - p2d[0],2) + Math.pow(y - p2d[1],2));
+				double tiny = 0.0001;
+				double futuredist = Math.sqrt(Math.pow(sx - (p2d[0] + Math.cos(ba) * tiny),2) + Math.pow(y - (p2d[1] + Math.sin(ba) * tiny),2));
+
+				if(interdist <=  bmag + r && futuredist < interdist){ 
+					//System.out.println("Carl Sagan" + i); //this is a pun because he wrote a book called Contact
+					if(i > preset.length){
+						int ball = (int) Math.floor((i - preset.length)/sides);
+						//System.out.println(balls[ball][2]);
+						points += balls[ball][3] * bmag;
+					}
+					v2d[0] = Math.cos(da) * bmag;
+					v2d[1] = Math.sin(da) * bmag;
+				}
+			}
+		}
+		g.setColor(Color.black);
+		//System.out.println(sx + " " + qx);
+		//System.out.println(ballslope + " " + lineslope);
+		//double slope = Math.atan2(v2d[1], v2d[0]);
+		//g.drawLine((int) p2d[0], (int) p2d[1], (int) (p2d[0]+10*v2d[0]), (int) (p2d[1]+10*v2d[1]));
+
+		g.fillRect(xpos - 5, (int)sd + 10, 10, 20);
+
+		g.drawString("Score: " + points + " Resets: " + lives, 10, 15);
+
+	}
+
+	private class Key extends KeyAdapter {
+		public void keyPressed(KeyEvent e){
+			if(e.getKeyCode() == KeyEvent.VK_DOWN){
+				setlock = true;
+				sd += 2;
+			}
+			if(e.getKeyCode() == KeyEvent.VK_LEFT){
+				ldown = true;
+			}
+			if(e.getKeyCode() == KeyEvent.VK_RIGHT){
+				rdown = true;
+			}
+		}
+		public void keyReleased(KeyEvent e){
+			setlock = false;
+			if(e.getKeyCode() == KeyEvent.VK_LEFT){
+				ldown = false;
+			}
+			if(e.getKeyCode() == KeyEvent.VK_RIGHT){
+				rdown = false;
+			}
+		}
+	}
+}

Studentdetails.java

@@ -0,0 +1,30 @@
+import java.util.Scanner; 
+class Studentdetails
+{
+String name; int rollno , age; 
+void input()
+{
+Scanner kb= new Scanner(System.in); 
+System.out.println("Enter the name of student:");
+name=kb.nextLine();
+System.out.println("Enter the roll no of student:");
+rollno=kb.nextInt();
+System.out.println("Enter the age of the student:"); 
+age=kb.nextInt();
+}
+}
+class Student extends Studentdetails
+{
+void display()
+{
+System.out.println("Name : " +name);
+System.out.println("Roll no: "+rollno); 
+System.out.println("Age : " +age);
+}
+public static void main(String args[])
+{
+Student s=new Student();
+s.input();
+s.display();
+}
+}

file.cpp

@@ -0,0 +1,39 @@
+#include <iostream>
+using namespace std;
+
+struct student
+{
+    char name[50];
+    int roll;
+    float marks;
+} s[10];
+
+int main()
+{
+    cout << "Enter information of students: " << endl;
+
+    for(int i = 0; i < 10; ++i)
+    {
+        s[i].roll = i+1;
+        cout << "For roll number" << s[i].roll << "," << endl;
+
+        cout << "Enter name: ";
+        cin >> s[i].name;
+
+        cout << "Enter marks: ";
+        cin >> s[i].marks;
+
+        cout << endl;
+    }
+
+    cout << "Displaying Information: " << endl;
+
+    for(int i = 0; i < 10; ++i)
+    {
+        cout << "\nRoll number: " << i+1 << endl;
+        cout << "Name: " << s[i].name << endl;
+        cout << "Marks: " << s[i].marks << endl;
+    }
+
+    return 0;
+}