Question

Below is a java program that inputs an integer grade and turns it into a letter grade.

Update the below java code as follows and comment each line to explain what is happening:

1. Convert the if-else-if code block to a switch statement to solve the problem.

2. Use modulus to convert the grade input so that the range of grades are converted to one value. (comment the line)

import java.util.Scanner;

public class GradeLetterTest {

public static void main(String[] args) {

Scanner scan = new Scanner(System.in);

System.out.println("Enter integer grade");

String s = "";

char c ;

int grade = scan.nextInt();

if(grade<0 || grade > 100) {

s ="ERROR You have entered an invalid input";

System.out.println(s);

} else {

if(grade>=90) {

c = 'A';

} else if(grade>=80 && grade<90) {

c = 'B';

} else if(grade>=70 && grade<80) {

c = 'C';

} else if(grade>=60 && grade<70) {

c = 'D';

} else {

c='F';

}

System.out.printf("You have earned the letter grade: %c\n",c);

}

}

}

Answer 1

Dear Student,

below i have modified the given Java program as per the requirement.

Please note that the below program is tested on ubuntu 14.04 sytem and compiled in javac compiler. This program will also work on other IDE's

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Program:

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import java.util.Scanner;

public class GradeLetterTest
{

public static void main(String[] args) {

Scanner scan = new Scanner(System.in);

System.out.println("Enter integer grade");

String s = "";

char c ;

int grade = scan.nextInt();

//here we have divded the input grade by 10 to convert into one digit

int input = grade/10;

//here we are switiching to each case

switch(input)

{

//if input is 10 or 9 grade is A

case 10:

case 9:

c = 'A';

System.out.printf("You have earned the letter grade: %c\n",c);

break;

//if input is 8 grade is B

case 8:
  
c = 'B';

System.out.printf("You have earned the letter grade: %c\n",c);

break;

//if input is 7 grade is C

case 7:
  
c = 'C';

System.out.printf("You have earned the letter grade: %c\n",c);

break;

//if input is 6 grade is D

case 6:
  
c = 'D';

System.out.printf("You have earned the letter grade: %c\n",c);

break;

//cases if grade is F

case 5:

case 4:

case 3:

case 2:

case 1:

case 0:

c = 'F';

System.out.printf("You have earned the letter grade: %c\n",c);

break;

//if grade is invalid i.e input

default:

s ="ERROR You have entered an invalid input";

System.out.println(s);

break;

}

}

}

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Sample Outputs:

nirmalsharma@ubuntu:~/HomeworkLib_solutions/01_02_2018Ş javac GradeLetterTest.java nirmalsharma@ubuntu:~/HomeworkLib_solutions/01_02_2018$ java GradeLetterTest 98 Enter integer grade You have earned the letter grade: A irmalsharna@ubuntu:-/HomeworkLib-solutions/01_ 02_2018$

nirmalsharma@ubuntu:~/HomeworkLib_solutions/01_02_2018$ java GradeLetterTest Enter integer grade -10 ERROR You have entered an invalid input nirmalsharma@ubuntu:-/HomeworkLib_solutions/01_02_2018s

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KIndly Check and Verify Thanks...!!!