codelab

Java Program To Swap Two Numbers Without Temporary Variable import java.util.Scanner; class SwapNumbers { public static void main(String args[]) { int x, y; System.out.println("Enter x and y:"); Scanner n = new Scanner(System.in); x = n.nextInt(); y = n.nextInt(); System.out.println("Before Swapping:\nx = "+x+"\ny = "+y); x = x + y; y = x - y; x = x - y; System.out.println("After Swapping:\nx = "+x+"\ny = "+y); n.close(); }} Java Program To Swap Two Numbers Using Temporary Variable import java.util.Scanner; class SwapNumbers2 { public static void main(String args[]) { int x, y, temp; System.out.println("Enter x and y:"); Scanner n = new Scanner(System.in); x = n.nextInt(); y = n.nextInt(); System.out.println("Before Swapping:\nx = "+x+"\ny = "+y);

Java Program To Find Area And Perimeter Of A Rectangle import java.util.*; public class AreaAndPerimeterOfRectangle { private static Scanner s; public static void main(String[] args) { double length, width, Area, Perimeter; s = new Scanner(System.in); System.out.print("Enter The Length Of A Rectangle =  "); length = s.nextDouble(); System.out.print("Enter The Width Of A Rectangle = "); width = s.nextDouble(); Area = length * width; Perimeter = 2 * (length + width); System.out.format("Area Of The Rectangle = %.2f\n",Area); System.out.format("Perimeter Of The Rectangle = %.2f\n", Perimeter); }} Java Program To Find Area And Perimeter Of A Rectangle Using OOP import java.util.Scanner; public class AreaAndPerimeterOfRectangle3a { private static Scanner s; public static void main(String[] args) { double length, width;  s = new Scanner(System.in);

Java Program To Reverse A Number Using Recursion (OOP) import java.util.Scanner; public class ReverseNumberUsingClassA { private static Scanner sc; public static void main(String[] args) { int Number, Reverse = 0; sc = new Scanner(System.in); System.out.print("Enter Any Number You Want To Reverse: "); Number = sc.nextInt(); ReverseNumberUsingClassB rn = new ReverseNumberUsingClassB(); Reverse = rn.NumberReverse(Number); System.out.format("\nReverse Of %d = %d",Number, Reverse); }} ReverseNumberUsingClassB.java: public class ReverseNumberUsingClassB { int Reverse = 0, Reminder; public int NumberReverse(int Number) { if(Number > 0) { Reminder = Number %10; Reverse = Reverse * 10+ Reminder; NumberReverse(Number /10); } return Reverse; }}

Problem: Java Program To Print Right Triangle Star Pattern import java.util.*; public class TrianglePattern1 { public static void main(String args[]) { int rows, i, j; Scanner in = new Scanner(System.in); System.out.print("Enter The Number Of Rows: "); rows = in.nextInt(); for(i = 1; i <= rows; i++) { for(j = 1; j <= i; ++j) { /* prints the rows of triangle */ System.out.print("* "); } System.out.print("\n"); /* move to next row */ in.close();  }}} Problem: Java Program To Print Inverted Right Triangle Star Pattern import java.util.Scanner; public class TrianglePattern2 { public static void main(String args[]) { int rows, i, j; Scanner in = new Scanner(System.in); System.out.print("Enter The Number Of Rows: "); rows = in.nextInt();

Problem: Java Program To Implement Calculator Using Applet. import java.awt.*; import java.awt.event.*; import java.applet.*; public class Calculator extends Applet implements ActionListener { private static final long serialVersionUID = 1L; String msg=" "; int v1,v2,result; TextField t1; Button b[]=new Button[10]; Button add,sub,mul,div,clear,mod,EQ; char OP; public void init() { Color k=new Color(120,89,90); setBackground(k); t1=new TextField(10); GridLayout gl=new GridLayout(3,3); setLayout(gl); for(int i=0;i<10;i++){ b[i]=new Button(""+i); }

Problem: Java Program To Find Factorial Of A Number import java.util.Scanner; class Factorial { public static void main(String args[]) { int n, c, fact = 1; System.out.print("Enter An Integer To Calculate It's Factorial: "); Scanner s = new Scanner(System.in); n = s.nextInt(); if ( n < 0 ) System.out.println("Number Must Be Non-negative."); else { for ( c = 1 ; c <= n ; c++ ) fact = fact*c; System.out.println("Factorial Of "+n+" Is = "+fact); s.close(); }}} Problem: Java Program To Find Factorial Of A Number Using Recursion import java.util.*; public class FactorialRecursion { public static void main(String args[]) { int num, factorial = 1; Scanner s = new Scanner(System.in); System.out.print("Enter An Integer To Calculate It's Factorial: "); num = s.nextInt(); if ( num < 0 ) System.out.println("Number Must Be Non-negative.");

The run command window is a fast and efficient way to directly access Windows' functions, without sifting through the Control Panel or other menus. I have summarized a comprehensive list of run commands that are tested in Windows 7, 8, and 10. The commands are not case-insensitive. Open the Run command window (press the windows Key + R). Afterward, type any of the following commands and click OK or press Enter. That’s it! Opens Press Windows + R and type: Open Documents Folder documents Open Videos folder videos Open Downloads Folder downloads Open Favorites Folder favorites Open Recent Folder recent Open Pictures Folder pictures Adding a new Device devicepairingwizard About Windows dialog winver Add Hardware Wizard hdwwiz Advanced User Accounts netplwiz Advanced User Accounts azman.msc Backup and Restore s...

Problem: Java Program To Solve Tower Of Hanoi Problem Using Stacks import java.util.*; public class TowerOfHanoiUsingStacks { public static int N; @SuppressWarnings("unchecked") public static Stack<Integer>[] tower = new Stack[4]; public static void main(String[] args) { Scanner scan = new Scanner(System.in); tower[1] = new Stack<Integer>(); tower[2] = new Stack<Integer>(); tower[3] = new Stack<Integer>(); System.out.print("Enter The Number Of Disks: "); int num = scan.nextInt(); N = num; toh(num); scan.close(); } /* Function to push disks into stack */ public static void toh(int n) { for (int d = n; d > 0; d--) tower[1].push(d); display(); move(n, 1, 2, 3); }

Problem: Java Program To Print “Hello World” class HelloWorld { public static void main(String args []) { System.out.println("Hello Java");  }} Problem: Java Program To Calculate And Display Area Of A Circle import java.util.*; class CalculateCircleAreaExample { private static Scanner s; public static void main(String[] args) { double r, area, pi = 3.14; s = new Scanner(System.in); System.out.print("Enter The Value Of Radius: "); r = s.nextDouble(); area = pi * r * r; // area of circle = pi*r*r System.out.println("The Area Of Circle Of Radius "+r+" = "+area); }} Problem: Java Program To Print Current Date And Time import java.util.Calendar; public class GetCurrentDateTimeExample { public static void main(String[] args) { Calendar now = Calendar.getInstance(); System.out.println("Current Year: " + now.get(Calendar.YEAR)); System.out.println("Current Month: " + (n...

Problem: A Simple Program To Find The Absolute Value Of An Integer. Method 1:  #include <iostream> using namespace std; int main() { int number; int abs_number; cout << "Enter an integer (positive or negative): " << endl; cin >> number; // Find the absolute value if(number >= 0) { abs_number = number; } else abs_number = -number; // Print out output cout << "The absolute value of " << number << " is " << abs_number; cout << endl; return 0; } Output: Enter an integer (positive or negative): -11 The absolute value of -11 is 11

if statement: #include <iostream> using namespace std; int main()  { int a, b; cout << "Enter first number: " << endl; cin >> a; cout << "Enter second number: " << endl; cin >> b; if(a < b) cout << "First number is less than second.\n"; return 0; } Output: Enter first number: 5 Enter second number: 7 First number is less than second. if-else statement: #include <iostream> using namespace std; int main()  { int a, b; cout << "Enter first number: " << endl; cin >> a; cout << "Enter second number: " << endl; cin >> b;

Hello World: // File name: hello_world.cpp // A simple C++ program which prints "Hello World!" on the screen. #include <iostream>        // header file to support the C++ I/O system. using namespace std;     // telling the compiler to use namespace "std", // where the entire C++ library is declared. int main() { cout << "Hello World!" <<  endl; /* *  cout is the standard output device on the screen. *  << causes the expression on its right to be directed to the device on its left. *  return 0; indicates the successful termination of the "main" function. */ return 0; } Output: Hello World! Variables And Constants: // File name: variable.cpp // Demonstrate the use of variables and constants. #include <iostream> using namespace std; const int CONST_VAL = 5; // declaring a constant. Its value can't be changed.

You may encounter situations, when a block of code needs to be executed multiple times. Loops are used in programming languages to repeat a specific block until some end condition is met. There are three loops in C programming: 1.    for loop 2.    while loop 3.    do...while loop A while loop in C programming repeatedly executes a target statement as long as a given condition is true. The syntax of a while loop is: while(condition)  { statement(s); } Here, statement(s) may be a single statement or a block of statements. The condition may be any expression, and if the condition is true (nonzero), codes inside the body of while loop is evaluated. The loop iterates while the condition is true. When the condition becomes false, the program control passes to the line immediately following the loop. The key point to note is that a  while  loop might not execute at all. When the condition is tested and the result is false...