Question

You will create a Grade Program that will calculate students’ weighted averages. You are going to have the user enter lab grades, test grades, and project grades. You will then display a grade report of each individual average along with their overall average and letter grade.

1. Ask the user to enter their lab grades. Call the averageGrade function that will allow the user to enter their grades and calculate their average.

2. averageGrade Function: This will pass the average back to the main function. You should NOT send any parameters to this function. You will be using a while loop, with a priming read and a sentinel value to end the loop. This means the user should be able to enter any number of grades that they want and exit the loop when they are done entering grades. When they exit the loop, compute the average (Make sure to desk check the average). Then you will return the average back.

     

3. Ask the user to enter their test grades. Again, call the averageGrade function that you created to average any number of grades.

4. Ask the user to enter their project grades. Again, call the averageGrade function.

5. Now you will calculate the students overall average in the class. Create a classAverage function to compute the average for the class from the 3 averages above. Use the following percentages as the weights for each of the grades (Lab – 50%, Tests – 40%, and Project – 10%). You will pass the function the 3 averages and return the final average.

6. Determine Letter Grade: Create a getLetterGrade function to determine the final letter grade based on their number average calculated in step 5. Make this a void function that is sent two parameters, the number grade by value and the letter grade by reference.

     

7. Display the Midterm Grade Report: Create a displayGradeReport function to output all of your results. This includes the lab average, test average, project average, class average, and class letter grade. This will also be a void function. Use setprecision() and setw() to make your output look nice.

8. Do While Loop: Ask user if they want to enter data for a new student. If yes, then clear the screen and loop back, if not then display some type of message to end the program.

When completed with the program there should be 4 functions in addition to the MAIN function.

Answer 1

#include<iostream>
#include <iomanip>
using namespace std;
float averageGrade()
{
   float temp;
   int count = 0;
   float sum = 0;
   float avg;
   cout<<"enter grade or -1 to quit:\t";
   cin>>temp;
   count++;
   sum += temp;
   while(temp != -1)
   {
       cout<<"enter grade or -1 to quit:\t";
       cin>>temp;
       count++;
       sum += temp;
   }
   avg = sum/count;
   return avg;
}
float classAverage(float avg_lab_grade, float avg_test_grade, float avg_project_grade)
{
   float avg;
   float temp_lab = (avg_lab_grade * 50)/100;
   float temp_test = (avg_test_grade * 40)/100;
   float temp_project = (avg_project_grade * 10)/100;
   avg = temp_lab + temp_test + temp_test;
   return avg;
}
void getLetterGrade(float marks, char* letter)
{
   if(marks >= 90)
   {
       *letter = 'A';
   }
   else if(marks >= 80 && marks < 90)
   {
       *letter = 'B';
   }
   else if(marks >= 70 && marks < 80)
   {
       *letter = 'C';
   }
   else if(marks >= 60 && marks < 70)
   {
       *letter = 'D';
   }
   else
   {
       *letter = 'F';
   }
}
void displayReports(float avg_lab_grade, float avg_test_grade, float avg_project_grade, float final_grade, char letter)
{
   cout<<"*****************REPORTS******************"<<endl;
   cout<<"Average Lab Grade:\t"<<setprecision(3)<<avg_lab_grade<<endl;
   cout<<"Average Test Grade:\t"<<setprecision(3)<<avg_test_grade<<endl;
   cout<<"Average Project Grade:\t"<<setprecision(3)<<avg_project_grade<<endl;
   cout<<"Average Final Grade:\t"<<setprecision(3)<<final_grade<<endl;
   cout<<"Average Letter Grade:\t"<<letter<<endl;
   cout<<"*******************************************"<<endl;
}
int main()
{
   char ch;
   do
   {
       cout << "\033[2J\033[1;1H";
       cout<<"enter lab grades:\t"<<endl;
       float avg_lab_grade;
       avg_lab_grade = averageGrade();
       cout<<"enter test grades:\t"<<endl;
       float avg_test_grade;
       avg_test_grade = averageGrade();
       cout<<"enter project grades:\t"<<endl;
       float avg_project_grade;
       avg_project_grade = averageGrade();
       float final_avg = classAverage(avg_lab_grade, avg_test_grade, avg_project_grade);
       char letter;
       getLetterGrade(final_avg, &letter);
       displayReports(avg_lab_grade, avg_test_grade, avg_project_grade, final_avg, letter);
       cout<<"want to enter reports of another student (y/n):\t";
       cin>>ch;
   }while(ch != 'n');
   cout<<"Thank You"<<endl;

  
}

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