Question

Question: How do I write a program in C# that calculates a student's final grade for a test with 20 multiple questions using arrays and helper methods?

Instructions:

(0-incorrect answer, 1-correct answer)

If the student answered the question right, add 5 points to the running total. If the student didn’t answer correctly subtract .5 points from the running total.

The running total is initialized with 5 points (so the student receives 5 points extra credit).

To define the final grade use the grading scale below

Score	Grade
90+	A
80-89	B
70-79	C
60-69	D
<60	F

Write a helper method displayScoreGrade()that displays the score and calculated grade.

    private static void displayGrade(double score, char grade){

        //printing the score;

        //printing the grade;

        ...        

     }

Call the method from the main method.

Answer 1

Source Code:

#include <iostream>

using namespace std;
//creating a class
class Main{
   //display grade function
private:static void displayGrade(double score, char grade){
//printing the score;
cout<<"Score is "<<score;
//printing the grade;
cout<<" Grade is "<<grade;

}
//calclating grade method
public:void calculateGrade(bool a[]){
    //intitalizing the score to 5
    double score=5;
    //variable to store grade
    char grade;
for(int i=0;i<20;i++){
    if(a[i]==0){
        //if it is wrong score reduced by 5
        score-=0.5;
           }else{
              // if it is correct score added by 5
              score+=5;
           }
       }
       if(score>=90){
grade='A';
} else if(score>=80){
grade='B';
} else if(score>=70){
grade='C';
} else if(score>=60){
grade='D';
} else{
grade='F';
}
       displayGrade(score,grade);
}
};

  
int main()
{
  
Main obj;
//creating object
bool a[20]={false};
//read values from system

int n;
for(int i=0;i<20;i++){
cout<<"enter"<< i <<"value 0 for false 1 For True ";
//read whether question is correct or not if it zero it is false else it is true
cin>>n;
if(n==0)
a[i]=0;
else
a[i]=1;
}
//cal to calculate grade and print it
obj.calculateGrade(a);

return 0;
}

Code Image

OUTPUT:

// We may get negative values since there is negative marking if the question is wrong

Answer 2

Coding

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MCQTest
{
class Program
{
private static void displayGrade(double score, char grade){
Console.WriteLine("Your Score is ::" + Convert.ToString(score));//output display score
Console.WriteLine("Your Grade is ::" + Convert.ToString(grade));//output display grade
}
static void Main(string[] args)
{
String[] question = new String[20] { "What is Capital Of India", "What is Capital Of Gujarat", "What is Capital Of India", "What is Capital Of Gujarat", "What is Capital Of India", "What is Capital Of Gujarat", "What is Capital Of India", "What is Capital Of Gujarat", "What is Capital Of India", "What is Capital Of Gujarat", "What is Capital Of India", "What is Capital Of Gujarat", "What is Capital Of India", "What is Capital Of Gujarat", "What is Capital Of India", "What is Capital Of Gujarat", "What is Capital Of India", "What is Capital Of Gujarat", "What is Capital Of India", "What is Capital Of Gujarat" };//HERE IS THE QUESTION LIST PLEASE MAKE YOUR OWN QUESTION LIST HERE I REPETEADED TWO QUESTION ALL THAT TIME ONLY
String[] A = new String[20] { "Delhi", "Baroda", "Delhi", "Baroda", "Delhi", "Baroda", "Delhi", "Baroda", "Delhi", "Baroda", "Delhi", "Baroda", "Delhi", "Baroda", "Delhi", "Baroda", "Delhi", "Baroda", "Delhi", "Baroda" };//OPTION A LIST
String[] B = new String[20] { "Kalkata", "Ahmdabad", "Kalkata", "Ahmdabad", "Kalkata", "Ahmdabad", "Kalkata", "Ahmdabad", "Kalkata", "Ahmdabad", "Kalkata", "Ahmdabad", "Kalkata", "Ahmdabad", "Kalkata", "Ahmdabad", "Kalkata", "Ahmdabad", "Kalkata", "Ahmdabad" };//OPTION B LIST
String[] C = new String[20] { "Goa", "Gandhinagar", "Goa", "Gandhinagar", "Goa", "Gandhinagar", "Goa", "Gandhinagar", "Goa", "Gandhinagar", "Goa", "Gandhinagar", "Goa", "Gandhinagar", "Goa", "Gandhinagar", "Goa", "Gandhinagar", "Goa", "Gandhinagar" };//OPTION C LIST ALL
String[] D = new String[20] { "Jaypur", "Bhuj", "Jaypur", "Bhuj", "Jaypur", "Bhuj", "Jaypur", "Bhuj", "Jaypur", "Bhuj", "Jaypur", "Bhuj", "Jaypur", "Bhuj", "Jaypur", "Bhuj", "Jaypur", "Bhuj", "Jaypur", "Bhuj" };//OPTION D LIST
String[] Answer = new String[20] { "A", "B", "A", "B", "A", "B", "A", "B", "A", "B", "A", "B", "A", "B", "A", "B", "A", "B", "A", "B" };//CORRECT ANSWER HERE
double score = 0;
Char grade=new Char();
for (int i = 0; i < question.Length; i++)
{
String YourAnswer;
Console.WriteLine("Question Number ::("+(i+1)+") "+Convert.ToString(question[i]));//OUTPUT DISPLAY OF QUESTION
Console.WriteLine("A)"+A[i]);//OUTPUT DISPLAY OPTION A
Console.WriteLine("B)"+B[i]);//OUTPUT DISPLAY OPTION B
Console.WriteLine("C)"+C[i]);//OUTPUT DISPLAY OPTION C
Console.WriteLine("D)"+D[i]);//OUTPUT DISPLAY OPTION D
Console.Write("Press Your Answer From(A,B,C,D) :");//write your answer
YourAnswer = Console.ReadLine();//readline from user
if (YourAnswer.Equals(Answer[i]))//if the answer is correct then
{
score = score + 5;//increment score here
}
else
{
score = score - 5;//decrement score here
}
}
if (score > 90)
{
grade = 'A'; //define grade
}
else if (score >= 80)
{
grade = 'B';//define grade
}
else if (score >= 70)
{
grade = 'C';//define grade
}
else if (score >= 60)
{
grade = 'D';//define grade
}
else if (score < 60)
{
grade = 'F';//define grade
}
displayGrade(score,grade);//call to display
}
}
}

output:

if you still have any Problem regarding this question please comment and if you like my code please appreciate me by thumbs up thank you.........