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import java.util.Scanner;
 
//Assignment1 class  
public class Assignment1  {
 
	//main method where execution starts 
	public static void main(String[] args) 
	{
		//local variables
		final int N = 10; 
		int lowestMark = 100, highestMark = 0, averageMark = 0, numberPassed = 0, numberFailed = 0, totalMark = 0, v = 0;
 
		//Grader class object
		Grader graderObject = new Grader();
 
		//Scanner class object to take input from user
		Scanner sc = new Scanner(System.in);
 
		//print welcome message
		System.out.println("***** Welcome to Calculate the grade *****");
 
		//loop to input marks, calculate and display grade, calculate summary values
		for(int i=0; i<N; i++)
		{
			//input mark
			System.out.print("\nMark for student " + (i+1) + ": ");
			int mark = sc.nextInt();
do{
 
				grade=s.nextLine();
				v=Integer.parseInt(grade);
				if(v<0 || v>100)
				{
					System.out.println("Enter Valid Mark");
				}
			}while(v<0 || v>100);
 
 
 
			    grade=g.grade(v)+"";
			    result=g.pass(v);
 
			//calculate grade using grade method from Grader class
			System.out.print("Grade for student " + (i+1) + ": " + graderObject.grade(mark));
 
			//calculate total mark of all students
			totalMark = totalMark + mark;
 
			//if statement for calculate lowest mark
			if(lowestMark > mark)
				lowestMark = mark;
 
			//if statement for calculate highest mark
			if(highestMark < mark)
				highestMark = mark;
 
			//if-else statement for count number of passed and failed students
			if(graderObject.pass(mark))
				numberPassed = numberPassed + 1;
			else
				numberFailed = numberFailed + 1;
		}
 
		//calculate average mark
		averageMark = totalMark / N;
 
		//generate and display summary
		System.out.println("\n\nSummary");
		System.out.println("********");
		System.out.println("Lowest mark: " + lowestMark); 
		System.out.println("Highest mark: " + highestMark);
		System.out.println("Average mark: " + averageMark); 
		System.out.println("Number passed: " + numberPassed);
		System.out.println("Number failed: " + numberFailed);
 
		// display exit message
		System.out.println("\nThank you!!!!!! Exit from program.......");
	}
}
 

Main.java:4: error: class Assignment1 is public, should be declared in a file named Assignment1.java
public class Assignment1  {
       ^
Main.java:14: error: cannot find symbol
		Grader graderObject = new Grader();
		^
  symbol:   class Grader
  location: class Assignment1
Main.java:14: error: cannot find symbol
		Grader graderObject = new Grader();
		                          ^
  symbol:   class Grader
  location: class Assignment1
Main.java:30: error: cannot find symbol
				grade=s.nextLine();
				^
  symbol:   variable grade
  location: class Assignment1
Main.java:30: error: cannot find symbol
				grade=s.nextLine();
				      ^
  symbol:   variable s
  location: class Assignment1
Main.java:31: error: cannot find symbol
				v=Integer.parseInt(grade);
				                   ^
  symbol:   variable grade
  location: class Assignment1
Main.java:40: error: cannot find symbol
			    grade=g.grade(v)+"";
			    ^
  symbol:   variable grade
  location: class Assignment1
Main.java:40: error: cannot find symbol
			    grade=g.grade(v)+"";
			          ^
  symbol:   variable g
  location: class Assignment1
Main.java:41: error: cannot find symbol
			    result=g.pass(v);
			    ^
  symbol:   variable result
  location: class Assignment1
Main.java:41: error: cannot find symbol
			    result=g.pass(v);
			           ^
  symbol:   variable g
  location: class Assignment1
10 errors

Standard output is empty