import java.util.*; 
 
public class Grades {  
    public static void main(String[] args) {
 
    	Scanner input = new Scanner(System.in);
 
       	//Variables
       	double grade = 0;
        double sum = 0;
    	double highest = 0;
    	double lowest = 100;
    	int counter = 0;
   	int Acounter = 0;
   	int Bcounter = 0;
   	int Ccounter = 0;
   	int Dcounter = 0;
   	int Fcounter = 0;
    	double Apercent = 0;    	
    	double Bpercent = 0;
	double Cpercent = 0;
    	double Dpercent = 0;
  	double Fpercent = 0;
 
    	//Header
    	System.out.println("\t\t\t\tGrades Program");
    	System.out.println("\nEnter valid student grades (in decimal values ranging from 0-100)." +
    					   "\nInvalid grades will not be considered. Enter -1 to view the results.\n\n");
 
    	//Scope of valid input numbers
		if (grade>=0 && grade<=100){	
 
		while ( grade != -1 ){	//sentinel value
			System.out.print("\tInput a grade: ");		
			grade = input.nextDouble();
 
		//Determines # of valid grades and # of each letter grade	
				if (grade<=100 && grade>=93){
					Acounter++;
					counter++;
					sum = sum+grade;
				}
				else if (grade<=92 && grade>=85){
					Bcounter++;
					counter++;
					sum = sum+grade;
				}
				else if (grade<=84 && grade>=75){
					Ccounter++;
					counter++;
					sum = sum+grade;
				}
				else if (grade<=75 && grade>=70){
					Dcounter++;
					counter++;
					sum = sum+grade;
				}
				else if (grade<=74 && grade>=0){
					Fcounter++;
					counter++;
					sum = sum+grade;
			}
		//Determines highest and lowest values		
				if (highest<grade){
				highest=grade;
				}
				if (lowest>grade){
				lowest=grade;	
				}
 
		}
	}
	//Calculations 	
	Apercent = ((Acounter/counter)*100);
	Bpercent = ((Bcounter/counter)*100);
	Cpercent = ((Ccounter/counter)*100);
	Dpercent = ((Dcounter/counter)*100);
	Fpercent = ((Fcounter/counter)*100);
 
	int pass = (Acounter+Bcounter+Ccounter+Dcounter);
	double passPercent = ((pass/counter)*100);
 
	double average = (sum/counter);
 
 
	//Output
	System.out.println("\n\nYour Results:");
	System.out.println("\n\nThe total amount of valid grades input were: " + counter);
 
	System.out.println("\nLetter Equivalent\tInstances\t% of total\t");
	System.out.println("\tAs:\t\t" + Acounter + "\t\t" + Apercent + "%");
	System.out.println("\tBs:\t\t" + Bcounter + "\t\t" + Bpercent + "%");
	System.out.println("\tCs:\t\t" + Ccounter + "\t\t" + Cpercent + "%");
	System.out.println("\tDs:\t\t" + Dcounter + "\t\t" + Dpercent + "%");
	System.out.println("\tFs:\t\t" + Fcounter + "\t\t" + Fpercent + "%");
	System.out.println("\n\tpass:\t\t" + pass + "\t\t" + passPercent + "%");
	System.out.println("\tfail:\t\t" + Fcounter + "\t\t" + Fpercent + "%");
	System.out.println("\nThe highest valid grade you entered was: " + highest);
	System.out.println("The lowest valid grade you entered was: " + lowest);
	System.out.println("\nThe average of the valid grades you entered is: " + average + "\n\n");
	}
}

public class Main {
 
	public static void main(String [] args) {
 
		double result;
 
		int value = 50;
		int count = 100;
 
		result = ((double)value / count) * 100;
 
		System.out.println(result);
	}
 
}

50.0

Apercent = (((double)Acounter/counter)*100.0);

				Grades Program
 
Enter valid student grades (in decimal values ranging from 0-100).
Invalid grades will not be considered. Enter -1 to view the results.
 
 
	Input a grade: 99
	Input a grade: 85
	Input a grade: 70
	Input a grade: 60
	Input a grade: 50
	Input a grade: 40
	Input a grade: 30
	Input a grade: -1
 
 
Your Results:
 
 
The total amount of valid grades input were: 7
 
Letter Equivalent	Instances	% of total	
	As:		1		14.285714285714285%
	Bs:		1		14.285714285714285%
	Cs:		0		0.0%
	Ds:		1		14.285714285714285%
	Fs:		4		57.14285714285714%
 
	pass:		3		42.857142857142854%
	fail:		4		57.14285714285714%
 
The highest valid grade you entered was: 99.0
The lowest valid grade you entered was: -1.0
 
The average of the valid grades you entered is: 62.0

if ((lowest>grade)  && (grade > -1)){
     lowest=grade;	
}