Question

Part I

Create a Java program that inputs a grade from the user. The grade input from the user will be an integer. Once the input is stored, use an if-else-if block of code to determine the letter grade of the inputted integer grade. Do not use a bunch of if statements by themselves to solve this problem. You will print an error message for inputs greater than 100 and for inputs less than 0. Both errors must be handled together by a compound conditional statement that is joined by a short circuit AND or OR operator. Assign your error message to a String variable and use that variable in a System.out.println statement to print the error. You must assign a char variable for each letter grade. Use System.out.printf to print the letter grade.

Run your program several times using these inputs and ensure that you are receiving these outputs:

• input: 140
  • expected output: ERROR - You have entered an invalid input.
• Input: -42
  • expected output: ERROR - You have entered an invalid input.
• input: 85
  • expected output: You have earned the letter grade B.

Run it a few more times using various other inputs

Answer 1

import java.util.*;

class GradeDemo
{
public static void main(String args[])
{
Scanner input=new Scanner(System.in);
int grade;
char letter;
String error="";

while(true)
{
System.out.print("Enter a grade : ");
grade=input.nextInt();

if(grade>100 || grade<0)
{
error="ERROR - You have entered an invalid input.";
System.out.println(error);
}
else
{
if(grade>=90)
{
letter='A';
System.out.printf("You have earned the letter grade %c .",letter);
break;
}
else if(grade>=60 && grade<90)
{
letter='B';
System.out.printf("You have earned the letter grade %c .",letter);
break;
}
else if(grade>=40 && grade<60)
{
letter='C';
System.out.printf("You have earned the letter grade %c .",letter);
break;
}
else
{
letter='D';
System.out.printf("You have earned the letter grade %c .",letter);
break;
}
}
}

}
}

Windews Powershel PS C:\Users\user\Desktop> javac GradelDemo. java ktop> java GradeDemo 140 Enter a grade: ERROR You have entered an invalid input. Enter a grade:-42 ERROR You have entered an invalid input. You have earned the letter grade B PS C: \Users\user\Desktop> java GradeDemo Enter a grade 98 You have earned the letter grade A. esktop> java GradeDemo Enter a grade: 45 You have earned the letter grade C. PS C: \Users\user\Desktop> java GradeDemo Enter a grade he letter grade D. PS C: \Users\user\Desktop> java GradeDemo Enter a grade: 789 ERROR You have entered an invalid input. Enter a grade 90 Enter a grade : 100red an invalid input. You have earned the letter grade A. PS C:\Users\user\Desktop> Cv ate Windows O Ivpe bere to search A d