Java Program to Find Salary of an Employee With Grade

import java.util.Scanner;
import java.lang.*;
class employeesalary
{
public static void main(String args[]) 
{
 float basic_salary,bonus1=0,bonus=0,gst;
 int grade;
 
 Scanner scan=new Scanner(System.in);

 System.out.println("Enter Basic Salary Of Employee : ");
 basic_salary=scan.nextFloat();

 System.out.println("\nEnter The Grade Of Employee : ");    
 grade=scan.nextInt();
 
if(grade==15)
{
 bonus=(basic_salary*15)/100;
} 
else if(grade==16 || grade==17 )
{
 bonus=(basic_salary*20)/100;
}
else if(grade>=18)
{
 bonus=(basic_salary*25)/100;
}
 
 basic_salary+=bonus;
 
if(basic_salary>=15000 && basic_salary=22000)
{
 gst=(basic_salary*15)/100;
 
 basic_salary-=gst;

 bonus1=(basic_salary*6)/100;

 basic_salary+=bonus1;
}
else
{
 bonus1=(basic_salary*6)/100;

 basic_salary+=bonus1;
} 
    System.out.println("\nGross Salary Of Employee : "+basic_salary);
}
}

Output:

Enter Basic Salary Of Employee : 

20000

Enter The Grade Of Employee : 

15

Gross salary of employee : 20723.0