Question

Java Program.

Sentinel While Loop Lab

Do the following:

• Prompts the user to enter a grade or a -1 to quit.
• IF the user entered a -1 THEN
  • Display a message that the User is done entering grades
• ELSE
  • Count each grade as it is entered.
  • Compute a running total of the grades entered.
• END IF
• After the user enters the sentinel of -1, calculate the average of the grades entered.
• When computing the average, make sure that there is no division by zero. Check to make sure the counter is not equal to zero.
• Make sure the sentinel is not counted as a grade.
• Print out a message stating the average of the grades entered.

Include the following:

1. Use a sentinel-controlled WHILE loop that uses a -1 as the sentinel to exit the loop.
   • Before counting the grades, initialize the counter to zero before the while loop begins.
2. While within the body of the ELSE:
   • Within the WHILE loop:
     • Prompt the User to enter a grade or a -1 to quit.
     • IF the input is not a -1 THEN
       • Count the grade.
       • Compute a running total of these grades as they are entered.
     • END IF
   • After the WHILE Loop is done executing, compute the average of all the grades entered. Remember to check to make sure you don't perform a division by zero.

NOTE 1:

• DO NOT use the "return 0" code, end, break, or exit to force an exit from within your IF/ELSE structure.  Declare all variables within the data declaration section.
  • Let the program progress to the end of the main function.
  • The end of the main function is the only place that the “return 0” should be placed.
  • A SWITCH statement is the only place that the break command should be used.
• DO NOT use the "continue" statement.

NOTE 2:

1. Declare all variables within the data declaration section of each class and method.  (-.1)
2   Do not get input on the same line as a variable declaration.  (-.1)
3. Do not place an equation for computation on the same line as declaring a variable.  (-.1)
4. Do not place an equation for computation on the same line as an output statement.  (-.1)

Thanks to whoever helps me!!! :)

Answer 1

code:

import java.util.Scanner;
class grade
{
   public static void main(String[] args)
   {
       int grade,count=0;
       double sum=0,average;
       /*Declaring variables*/
       Scanner scnr=new Scanner(System.in);/*Creating Scanner object*/
       System.out.print("enter a grade or a -1 to quit: ");
       grade=scnr.nextInt();
       /*Reading grde from the user*/
       sum+=grade;
       while(grade!=-1)
       {
           /*This loop execute untill grade is equals to -1*/
           System.out.print("enter a grade or a -1 to quit: ");
           grade=scnr.nextInt();/*Reading grade form the user*/
           sum+=grade;
           /*Adding grade to the sum*/
           count+=1;/*Increading the count*/
       }
       sum+=1;
       /*HEre we add 1 to sum because
       in the loop we add -1 to sum when user enters -1*/
       if(count!=0)
       {
           average=(sum/count);
           /*If count not equals to we prin the average*/
           System.out.println("Average Grade:"+average);  
       }
       else
       {
           /*Else we print average as 0*/
           System.out.println("Average Grade:"+0.0);
       }
   }
}

Output:

Indentation: