TestWeek1.txt

1)
user input :
Declare and Initialize Variables:
Declare an integer variable named age and initialize it with the value 25.
Declare a double variable named price and initialize it with the value 19.99.


public class Test {
    public static void main(String[] args){

        int age;
        age=25;
        double price;
        price= 19.99f;
        System.out.println("Age= " + age);
        System.out.println("Price= " + price);
    }
}

Output:
Age= 25
Price= 19.989999771118164

--------------------------------------------------------------------

2)
user input :
Performing Operations:
Create two variables, num1 and num2, with values 10 and 5 respectively. Perform addition, subtraction, multiplication, and division operations on them.


public class Test {
    public static void main(String[] args){

        int num1= 10, num2= 5, add, sub, mul, div;
        add= num1 + num2;
        sub= num1 - num2;
        mul= num1 * num2;
        div= num1 / num2;
        System.out.println(num1 + " + " + num2 + " = " + add);
        System.out.println(num1 + " - " + num2 + " = " + sub);
        System.out.println(num1 + " * " + num2 + " = " + mul);
        System.out.println(num1 + " / " + num2 + " = " + div);
    }
}

Output:
10 + 5 = 15
10 - 5 = 5
10 * 5 = 50
10 / 5 = 2

--------------------------------------------------------------------

3)
Boolean Operations:
Declare two boolean variables, isJavaFun and isCodingEasy, and initialize them with appropriate values.


public class Test {
    public static void main(String[] args){

        boolean isJavaFun;
        boolean isCodingEasy;
        isJavaFun= true;
        isCodingEasy= false;
        System.out.println("Is java fun? " + isJavaFun);
        System.out.println("Is Coding Easy? " + isCodingEasy);
    }
}

Output:
Is java fun? true
Is Coding Easy? false

--------------------------------------------------------------------

4)
String Length:
Declare a String variable named text and initialize it with any text.

import java.util.Scanner;
public class Test {
    public static void main(String[] args){

    Scanner sc= new Scanner(System.in);
    String text;
    System.out.print("Enter some text: ");
    text= sc.nextLine();
    System.out.println(text);
    }
}

Output:
Enter some text: Java is a programming language
Java is a programming language

--------------------------------------------------------------------

5)
Even or Odd:
Write a Java program to check if a given number is even or odd.


import java.util.Scanner;
public class Test {
    public static void main(String[] args){

        Scanner sc= new Scanner(System.in);
        int num;
        System.out.print("Enter a number: ");
        num= sc.nextInt();
        if(num%2==0){
            System.out.println(num + " is an even number");
        }
        else{
            System.out.println(num + " is an odd number");
        }
    }
}

Output:
Enter a number: 246
246 is an even number

--------------------------------------------------------------------

6)
Leap Year:
Create a Java program to determine if a given year is a leap year.

import java.util.Scanner;
public class Test {
    public static void main(String[] args){

        Scanner sc= new Scanner(System.in);
        int year;
        System.out.print("Enter an year: ");
        year= sc.nextInt();
        if(year%4==0 && year%100!=0){
            System.out.println(year + " is a leap year");
        }
        else{
            System.out.println(year + " is not a leap year");
        }
    }
}

Output:
Enter an year: 2024
2024 is a leap year

--------------------------------------------------------------------

7)
Positive, Negative, or Zero:
Create a Java program to check if a given number is positive, negative, or zero.


import java.util.Scanner;
public class Test {
    public static void main(String[] args){

        Scanner sc= new Scanner(System.in);
        int num;
        System.out.print("Enter an integer number: ");
        num= sc.nextInt();
        if(num>0){
            System.out.println(num + " is a positive number");
        }
        else if(num<0){
            System.out.println(num + " is a negative number");
        }
        else{
            System.out.println("number entered is equal to zero");
        }
    }
}

Output:
Enter an integer number: -12
-12 is a negative number

--------------------------------------------------------------------

8)
Grade Calculator:
Develop a Java program that takes a student's score as input and prints their grade (A, B, C, D, or F).

import java.util.Scanner;
public class Test {
    public static void main(String[] args){

        Scanner sc= new Scanner(System.in);
        String name;
        char grade;
        int m1, m2, m3, m4, m5;
        float total, per;
        System.out.print("Enter name: ");
        name= sc.next();
        System.out.println("Enter marks of the respective subjects: ");
        System.out.print("Hindi: ");
        m1= sc.nextInt();
        System.out.print("English: ");
        m2= sc.nextInt();
        System.out.print("Math: ");
        m3= sc.nextInt();
        System.out.print("Science: ");
        m4= sc.nextInt();
        System.out.print("SST: ");
        m5= sc.nextInt();

        total= m1+m2+m3+m4+m5;
        per= (total/500) * 100;

        if(per>90){
            grade= 'A';
        }
        else if(per>80 && per<=90){
            grade= 'B';
        }
        else if(per>=65 && per<=80){
            grade= 'C';
        }
        else if(per>50 && per<65){
            grade= 'D';
        }
        else if(per>34 && per<=50){
            grade= 'E';
        }
        else{
            grade= '-';
            System.out.println("Fail");
        }
        System.out.println();
        System.out.println("Name: " + name);
        System.out.println("Total marks out of 500: " + total);
        System.out.println("Percentage: " + per);
        System.out.println("Grade: " + grade);
    }
}

Output:
Enter name: Aryan
Enter marks of the respective subjects: 
Hindi: 72
English: 84
Math: 89
Science: 91
SST: 56

--------------------------------------------------------------------

9)
Print even numbers between 20 and 30 using a while loop.

public class Test {
    public static void main(String[] args){

        int i=20;
        while(i<=30){
            if(i%2==0){
                System.out.print(i + " ");
            }
            i++;
        }
    }
}

Output:
20 22 24 26 28 30 

--------------------------------------------------------------------

10)
Calculate the sum of first 100 natural numbers using a for loop.

public class Test {
    public static void main(String[] args){

        int sum=0;
        for(int n=1; n<=100; n++){
            sum+= n;
        }
        System.out.println("Sum of first 100 natural numbers: " + sum);
    }
}

Output:
Sum of first 100 natural numbers: 5050

--------------------------------------------------------------------

11)
Print the Fibonacci series up to 10 terms using a for loop.


public class Test {
    public static void main(String[] args){

        int n1=0, n2=1, sum=0;
        System.out.print("Fibonacci series: " + n1 + " " + n2 + " ");
        for(int i=3; i<=10; i++){
            sum= n1 + n2;
            System.out.print(sum + " ");
            n1=n2;
            n2=sum;
        }
    }
}

Output:
Fibonacci series: 0 1 1 2 3 5 8 13 21 34

--------------------------------------------------------------------

12)
Write a program to find the factorial of a number using a while loop.13)

import java.util.Scanner;
public class Test {
    public static void main(String[] args){

        Scanner sc= new Scanner(System.in);
        int n, i=1, fact=1;
        System.out.print("Enter a number: ");
        n= sc.nextInt();
        while(i<=n){
            fact= fact*i;
            i++;
        }
        System.out.println("Factorial of " + n + " is " + fact);

    }
}

Enter a number: 5
Factorial of 5 is 120

--------------------------------------------------------------------

14)
Check if a given number is a palindrome using a using loop.


import java.util.Scanner;
public class Test {
    public static void main(String[] args){

        Scanner sc= new Scanner(System.in);
                int n, rem, sum=0;
                System.out.print("Enter a number: ");
                n= sc.nextInt();
                int org_n=n;
                while(n>0){
                    rem= n%10;
                    sum= (sum *10) + rem;
                    n= n/10;
                }
                if(org_n==sum) {
                    System.out.println(org_n + " is a pallindrome number");
                }
                else {
                    System.out.println(org_n + " is not a pallindrome number");
                }

    }
}


Output:
Enter a number: 12321
12321 is a pallindrome number

--------------------------------------------------------------------

15)
Rock-Paper-Scissors Game:
Create a Java program for a simple Rock-Paper-Scissors game using if-else if conditions.

import java.util.Scanner;
public class Test {
    public static void main(String[] args){

        Scanner sc= new Scanner(System.in);
        String player1="rock", player2;
        System.out.print("Enter Rock/Paper/Scissors: ");
        player2= sc.next();
        if(player2.equals("Rock")){
            System.out.println("Tie");
        }
        else if(player2.equals("Paper")){
            System.out.println("You win");
        }
        else if(player2.equals("Scissors")){
            System.out.println("You lose");
        }
        else{
            System.out.println("Choose a valid option");
        }

    }
}

Output:
Enter Rock/Paper/Scissors: Paper
You win

--------------------------------------------------------------------

16)
Temperature Converter:
Write a Java program that converts temperature from Celsius to Fahrenheit or vice versa based on user input using if-else statements.

import java.util.Scanner;
public class Test {
    public static void main(String[] args){

        Scanner sc= new Scanner(System.in);
        float temp, c, f;
        String unit;
        System.out.print("Input temperature in celcius/fahrenheit: ");
        unit= sc.next();
        if(unit.equals("celcius")){
            System.out.print("Enter temperature in celcius: ");
            temp= sc.nextFloat();
            f= (temp*9)/5 + 32;
            System.out.println(temp + "C" + " = " + f + "F");
        }
        else if(unit.equals("fahrenheit")){
            System.out.print("Enter temperature in fahrenheit: ");
            temp= sc.nextFloat();
            c= ((temp-32)*5)/9;
            System.out.println(temp + "F" + " = " + c + "C");
        }

    }
}

Output:
Input temperature in celcius/fahrenheit: fahrenheit
Enter temperature in fahrenheit: 92
92.0F = 33.333332C

--------------------------------------------------------------------

17)
Ticket Reservation System:
Develop a Java program for a simple ticket reservation system that checks seat availability and age restrictions using if-else if conditions.

18)
Even or Odd and Positive or Negative:
Create a Java program that checks if a number is even or odd and positive or negative using nested if-else statements.

import java.util.Scanner;
public class Test {
    public static void main(String[] args){

        Scanner sc= new Scanner(System.in);
        int n;
        System.out.print("Enter a number: ");
        n= sc.nextInt();
        if(n%2==0){
            System.out.println("Even number");
            if(n>0){
                System.out.println("Positive number");
            }
            else if(n<0){
                System.out.println("Negative number");
            }

        }
        else if(n%2==1){
            System.out.println("Odd number");
            if(n>0){
                System.out.println("Positive number");
            }
            else if(n<0){
                System.out.println("Negative number");
            }
        }

    }
}

Output:
Enter a number: 23
Odd number
Positive number

--------------------------------------------------------------------


19)
Month Name:
Develop a Java program that takes a month number as input and prints the month's name using switch.

import java.util.Scanner;
public class Test {
    public static void main(String[] args){

        Scanner sc= new Scanner(System.in);
        int n;
        System.out.print("Enter a month number: ");
        n= sc.nextInt();
        switch(n){
            case 1:
            {
                System.out.println("January");
                break;
            }
            case 2:
            {
                System.out.println("February");
                break;
            }
            case 3:
            {
                System.out.println("March");
                break;
            }
            case 4:
            {
                System.out.println("April");
                break;
            }
            case 5:
            {
                System.out.println("May");
                break;
            }
            case 6:
            {
                System.out.println("June");
                break;
            }
            case 7:
            {
                System.out.println("July");
                break;
            }
            case 8:
            {
                System.out.println("August");
                break;
            }
            case 9:
            {
                System.out.println("September");
                break;
            }
            case 10:
            {
                System.out.println("October");
                break;
            }
            case 11:
            {
                System.out.println("November");
                break;
            }
            case 12:
            {
                System.out.println("December");
                break;
            }
            default:
            {
                System.out.println("Input mismatch");
            }
        }

    }
}

Output:
Enter a month number: 6
June

--------------------------------------------------------------------

20)
Ticket Pricing:
Create a Java program to calculate the ticket price based on the age group (child, adult, senior).

import java.util.Scanner;
public class Test {
    public static void main(String[] args){

        Scanner sc= new Scanner(System.in);
        float tprice=100, discount=0, total;
        String who;
        System.out.print("Ticket is for child/adult/senior? ");
        who= sc.next();

        if(who.equals("child")){
            discount= 0.20f * tprice;
        }
        else if(who.equals("senior")){
            discount= 0.10f * tprice;
        }
        else if(who.equals("adult")){
            discount= 0;
        }

        total= tprice - discount;
        System.out.println();
        System.out.println("Ticket Price = " + tprice);
        System.out.println("Discount = " + discount);
        System.out.println("Amount payable = " + total);

    }
}

Output:
Ticket is for child/adult/senior? senior

Ticket Price = 100.0
Discount = 10.0
Amount payable = 90.0