Java program

1. Write a program to 'Geet' a person if entered hour is more than 18 then wish "Good evening" otherwise "Have a nice day"

package all;

import java.util.Scanner;

//Greeting a person

public class greeting {

  public static void main(String[] args) {

   Scanner sc= new Scanner(System.in);

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

  int hr=sc.nextInt();

  if(hr>18)

  System.out.println("Good Evening !!!");

  else

System.out.println("Have a nice day!!!");

  }

}

2) Write a program to check candidate is eligible for vote or not.

package all;

import java.util.Scanner;

//voiting 

public class vote_eligible {

  public static void main(String[] args) {

   Scanner sc= new Scanner(System.in);

   System.out.println("Enter your Age: ");

  int age=sc.nextInt();

  if(age>18)

  System.out.println("Eligible for vote!!!");

  else

  {

 int elg=18-age;

System.out.println("You are Eligible after "+elg+" Years");

} } }

3) Write a program to check whether given number is positive or negative or zero.

package all;

import java.util.Scanner;

//checking number +,-,0

public class check_number {

  public static void main(String[] args) {

   Scanner sc= new Scanner(System.in);

   System.out.println("Enter any number ");

  int n=sc.nextInt();

  if(n>0)

  System.out.println("Positive number!!!");

  else if (n<0)

System.out.println("Negative number");

else

System.out.println("Given number is zero");

}

}

4) Write a program to check grades of a student using their marks.

package all;

import java.util.Scanner;

//Student grade

public class grade {

  public static void main(String[] args) {

   Scanner sc= new Scanner(System.in);

   System.out.println("Enter your marks: ");

  int m=sc.nextInt();

  if(m<50)

  System.out.println("Fail");

  else if (m>=50&&m<60)

System.out.println("D grade");

  else if (m>=60&&m<70)

System.out.println("C grade");

  else if (m>=70&&m<80)

System.out.println("B grade");

  else if (m>=80&&m<90)

System.out.println("A grade");

else if (m>=90&&m<=100)

System.out.println("O grade");

}

}

5) Write a program to find biggest among 3 numbers.

package all;

import java.util.Scanner;

//Biggest of 3 numbers

public class Biggest_number {

  public static void main(String[] args) {

   Scanner sc= new Scanner(System.in);

   System.out.println("Enter your 3 numbers:");

  int a=sc.nextInt();

  int b=sc.nextInt();

  int c=sc.nextInt();

  if(a>b&&a>c)

  System.out.println("A is greater");

  else if (b>a&&b>c)

System.out.println("B is greater");

  else 

System.out.println("C greater");

}

}

6) Write a program to find whether given year is leap year or not.

package all;

import java.util.Scanner;

//leap year

public class leap_year {

  public static void main(String[] args) {

   Scanner sc= new Scanner(System.in);

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

  int yr=sc.nextInt();

  if(yr%4==0)

  System.out.println("Leap year!!!");

  else

System.out.println("Not a leap year!!!");

  }

}

Note: I am not responsible if any program is wrong, so write at your own risk.