[OOP (CS 594D)] Assignment 1

Assignment 1

• Write a Java program to print “Hello World”.

Source code:

public class HelloWorldnormal {

	public static void main(String[] args) {
		System.out.println("Hello World");
	}
}

Output:

$ javac HelloWorldnormal.java

$ java HelloWorldnormal
Hello World

• Write a Java program to.pront “Hello World”, where ‘World’ will be taken from command line argument.

Source code:

public class HelloWorldCLA {

	public static void main(String[] args) {
		System.out.println("Hello " + args[0]);
	}
}

Output:

$ javac HelloWorldCLA.java

$ java HelloWorldCLA World
Hello World

Source code:

public class SumOf2NumbersCLA {

	public static void main(String[] args) {
		System.out.println("Sum of " + args[0] + " and " + args[1] + " is " + (Integer.parseInt(args[0]) + Integer.parseInt(args[1])));
	}
}

Output:

$ javac SumOf2NumbersCLA.java

$ java SumOf2NumbersCLA 7 8
Sum of 7 and 8 is 15

0 HELLO NAME1
1 HELLO NAME2
2 HELLO NAME3

Source code:

public class Greeting {

	public static void main(String[] args) {
		for (int i = 0; i < args.length; i++) {
			System.out.println(i + " HELLO " + args[i]);
		}
	}
}

Output:

$ javac Greeting.java

$ java Greeting Debakar Baka Dr_NULL
0 HELLO Debakar
1 HELLO Baka
2 HELLO Dr_NULL

Source code:

import java.util.Scanner;

public class Swap2Numbers {

	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);

		System.out.print("\nEnter two numbers: ");
		int a = input.nextInt(), b = input.nextInt();
		input.close();

		System.out.println("\nBefore Swap: a = " + a + ", b = " + b);
		a = a + b;
		b = a - b;
		a = a - b;
		System.out.println("\nAfter Swap: a = " + a + ", b = " + b);
	}
}

Output:

$ javac Swap2Numbers.java

$ java Swap2Numbers

Enter two numbers: 67 54

Before Swap: a = 67, b = 54

After Swap: a = 54, b = 67

1 2 3 4 5
2 3 4 5
3 4 5
4 5
5

Source code:

import java.util.Scanner;

public class Pattern1 {

	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);

		System.out.print("\nEnter number of line for the pattern: ");
		int n = input.nextInt();
		input.close();

		for (int i = 1; i <= n; i++) {
			for (int j = i; j <= n; j++) {
				System.out.print(j + " ");
			}
			System.out.println();
		}

	}
}

Output:

$ javac Pattern1.java

$ java Pattern1

Enter number of line for the pattern: 5
1 2 3 4 5
2 3 4 5
3 4 5
4 5
5

if marks <= 40 - Fail
41 to 50 - Average
51 to 60 - Fair
61 to 70 - Good
71 to 80 - Very good
81 to 90 - Excellent
91 to 100 - Outstanding

Source code:

import java.util.Scanner;

public class RemarkCard {

	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);

		System.out.print("\nEnter the marks of the students: ");
		int marks = input.nextInt();
		input.close();

		if (marks <= 40)
			System.out.println("Fail.");
		else if (marks >= 41 && marks <= 50)
			System.out.println("Average.");
		else if (marks >= 51 && marks <= 60)
			System.out.println("Fair.");
		else if (marks >= 61 && marks <= 70)
			System.out.println("Good.");
		else if (marks >= 71 && marks <= 80)
			System.out.println("Very Good.");
		else if (marks >= 81 && marks <= 90)
			System.out.println("Excellent.");
		else
			System.out.println("Outstanding.");
	}
}

Output:

$ javac RemarkCard.java

$ java RemarkCard

Enter the marks of the students: 95
Outstanding.

• Write a Java program to print this kind of pattern.

    *
   * *
  * * *
 * * * *
* * * * *

Source code:

import java.util.Scanner;

public class Pattern2 {

	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);

		System.out.println("\nEnter number of line for the pattern: ");
		int n = input.nextInt();
		input.close();

		for (int i = 0; i < n; i++) {
			for (int j = i; j < n - 1; j++) {
				System.out.print(" ");
			}
			for (int j = 0; j <= i; j++) {
				System.out.print("* ");
			}
			System.out.println();
		}
	}
}

Output:

$ javac Pattern2.java

$ java Pattern2

Enter number of line for the pattern: 5
    *
   * *
  * * *
 * * * *
* * * * *