Question

I am having trouble getting this program to run with 3 parts. Could I get assistance to understand this code as well?

Here is the information given.

7.20 Chapter 7A

Create the class described by the UML and directions are given below:

Student
- studentName: string - midterm: int - finalGrade: int
+Student() +Student(name: string, midterm: int, fin: int) +setMidterm(grade: int): void +setFinal(grade: int): void + setStudentName(studentName: string): void +getName():String +getMidterm():int +getFinal():int +computeAverage(): double +computeLetterGrade(): string +printGradeReport():void

Create the class using three files - a .h, a .cpp and a main.cpp:

• Constructor with no arguments
  • sets the string to an empty string, and all numbers to 0
• Constructor with arguments
  • Sets the studentName, midterm and finalGrade to the values passed in
• Get methods (accessors) return the field that the get refers to
• Set methods (mutators) set the field to the new values passed in to it
• computeAverage - compute the average of the midterm and finalGrade
• computeLetterGrade - calls the computeAverage function and then computes whether the student received an A, B, C, D, or F
• printGradeReport - prints the following grade report for each student (there are 24 asterisks)

Grade Report
************************
Name: Jorddan
Midterm Grade: 85
Final Grade: 74
Average: 79.5    B

Once you have finished the class and tested it with your main, make your main do the following: [Note: there are no loops!!!!]

• create three student objects with the following information
  • John, midterm 84, final 93
  • Lori, midterm 74, final 81
  • Theo, midterm 96, final 94
• print the student reports using the member function
• print each student in a row as shown in the output below

Grade Report
************************
Name: John
Midterm Grade: 84
Final Grade: 93
Average: 88.5    B
Grade Report
************************
Name: Lori
Midterm Grade: 74
Final Grade: 81
Average: 77.5    C
Grade Report
************************
Name: Theo
Midterm Grade: 96
Final Grade: 94
Average: 95    A

Name         Average     Grade
John            88.5         B
Lori            77.5         C
Theo              95         A

Thank you for your assistance.

Answer 1

#include <iostream>
#include<string>
using namespace std;
class Student
{
string studentName;
int midterm;
int finalGrade;
public:
Student()//default constructor
{
studentName="";
midterm=0;
finalGrade=0;
}
Student(string name,int midterm,int fin)//Parameterized Constructor
{
studentName=name;
this->midterm=midterm;
finalGrade=fin;

}
void setMidterm(int grade)//function to set midterm marks
{
midterm=grade;
}
void setFinal(int grade)//function to set Final marks
{
finalGrade=grade;
}
void setStudentName(string studentName)//Function to set student name
{
this->studentName= studentName;
}
string getName()//function to get the student name
{
return studentName;
}
int getMidterm()//function to get the midterm marks
{
return midterm;
}
int getFinal()//function to get the final marks
{
return finalGrade;
}
double computeAverage()//function to compute average of midterm and final marks
{
return (midterm+finalGrade)/2.0;
}
string computeLetterGrade()//function to compute grade according to the average marks
{ string b;
double a=computeAverage();
if(a>=90 && a<=100)
{b='A';
return b;
}
else if (a>=80 && a<=89)
{b='B';
return b;
}
else if(a>=70 && a<=79)
{b='C';
return b;
}
else if(a>=60 && a<=69)
{b='D';
return b;
}
else if(a>=50 && a<=59)
{b='E';
return b;
}

}
void printGradeReport()//To print grade report which contains details of student
{
cout<<endl;
cout<<"Grade Report"<<endl;
cout<<"************************"<<endl;
cout<<"Name: ";
cout<<studentName<<endl;
cout<<"Midterm Grade: ";
cout<<midterm<<endl;
cout<<"Final Grade: ";
cout<<finalGrade<<endl;
cout<<"Average:";
cout<<computeAverage();
cout<<" "<<computeLetterGrade();
cout<<endl;

}
};
int main() {
Student s1("John",84,93);//test case 1
Student s2("Lori",74,81);//test case 2
Student s3("Theo",96,94);//test case 3
s1.printGradeReport();//Printing grade report of student s1
s2.printGradeReport();//Printing grade report of student s2
s3.printGradeReport();//Printing grade report of student s3
cout<<endl;
//Printing the details of all the students
cout<<"Name Average Grade"<<endl;
cout<<s1.getName()<<" ";
cout<<s1.computeAverage()<<" ";
cout<<s1.computeLetterGrade()<<endl;
cout<<s2.getName()<<" ";
cout<<s2.computeAverage()<<" ";
cout<<s2.computeLetterGrade()<<endl;
cout<<s3.getName()<<" ";
cout<<s3.computeAverage()<<" ";
cout<<s3.computeLetterGrade();
return 0;
}