Basic Java Programs

 Basic Java Programs

Basic Java Concept Assignment -- User Input

1. WAP to swap two numbers without using temp variable.

package assignments;

import java.util.Scanner;

public class Swap2NumbersWithoutTemp {

public static void main(String args[]) {

Scanner sc = new Scanner(System.in);

int number1, number2;

System.out.println("Enter one number: ");

number1=sc.nextInt();

System.out.println("Enter second number: ");

number2= sc.nextInt();

System.out.println("Numbers before swapping: ");

System.out.println(number1);

System.out.println(number2);

// swap with temp variable

number1 = number1 + number2;

number2 = number1 - number2;

number1 = number1 - number2;

System.out.println("Numbers after swapping are: ");

System.out.println(number1);

System.out.println(number2);

}

}

Output:

Enter one number: 

3

Enter second number: 

4

Numbers before swapping: 

3

4

Numbers after swapping are: 

4

3

2. WAP program to calculate Perimeter of Circle.

package assignments;

import java.util.Scanner;

public class CircumfrenceCircle {

public static void main(String[] args) {

int r;

double circumference;

Scanner sc = new Scanner(System.in);

System.out.println("Enter radius:");

r= sc.nextInt();

sc.close();

    circumference = 2 * 3.14 * r;

System.out.println("Circumference of the circle is: " + circumference);

}

}

Output: 

Enter radius:

3

Circumference of the circle is: 18.84

3. WAP program to find Area of Circle.

package assignments;

import java.util.Scanner;

public class AreaCircle {

public static void main(String[] args) {

System.out.println("Area of circle");

int radius;

double circumference;

Scanner sc = new Scanner(System.in);

System.out.println("Enter radius:");

radius= sc.nextInt();

sc.close();

    circumference = 3.14 * (radius*radius);

System.out.println("Area of the circle is: " + circumference);

}

}

Output:

Area of circle

Enter radius:

2

Area of the circle is: 12.56

4. WAP program to find Area of Rectangle.

package assignments;

import java.util.Scanner;

public class Area5 {

public static void main(String[] args) {

int number1, number2, total;

Scanner sc = new Scanner(System.in);

System.out.println("Input length:");

number1 = sc.nextInt();

System.out.println("Input width:");

number2 = sc.nextInt();

sc.close();

    total = number1 * number2;

System.out.println("Area of the rectangle: " + total);

}

}

Output:

Input length:

3

Input width:

2

Area of the rectangle: 6

5. WAP program to find Area of Triangle.

package assignments;

import java.util.Scanner;

public class AreaOfTriangle {

public static void main(String[] args) {

int number1, number2, total;

Scanner sc = new Scanner(System.in);

System.out.println("Input base:");

number1 = sc.nextInt();

System.out.println("Input height:");

number2 = sc.nextInt();

sc.close(); 

    total = number1 * number2/2;

System.out.println("Area of the triangle: " + total);

}

}

Output:

Input base:

2

Input height:

10

Area of the triangle: 10

6. WAP program to calculate Simple Interest.

package assignments;

import java.util.Scanner;

public class SimpleInterest {

public static void main(String[] args) {

int p, t, r;

double interest;

Scanner sc = new Scanner(System.in);

System.out.println("Enter principle: ");

p = sc.nextInt();

System.out.println("Enter time: ");

t = sc.nextInt();

System.out.println("Enter rate: ");

r = sc.nextInt();

sc.close(); 

    interest = (p * t * r) / 100;

System.out.println("Simple Interest " + interest);

}

}

Output:

Enter principle: 

100

Enter time: 

1

Enter rate: 

1

Simple Interest 1.0