Question

1. In C++, Mrs. Jones wishes to computerize her grading system. She gives 5 tests but only counts the 4 highest scores. Input the 5 test scores and output the average of the highest four. And using the following grading scale, 90-100 A, 80-89 B, 70-79 C, 60-69 D, and below 60 F, output the student’s letter grade. After creating this code, Modify the above to calculate the grade for all students in the class. The first input value will be the number of students in the class. You will then need to use a loop to input the students’ names as well as their 5 grades. Inside the loop (after calculating the average for the student) you will need to add each student’s average to a sum variable because at the end, you will need to print out the class average as well as each students’ names and letter grades.

Answer 1

Part 1:

#include<bits/stdc++.h>
using namespace std;
int main(){
    int sum=0,min=999;
    int marks[5];
    char grade;
    for(int i=0;i<5;i++){
        cout<<"Marks of Test "<<i+1<<": "<<endl;
        cin>>marks[i];
        if(min>marks[i]){
            min=marks[i];
        }
        sum+=marks[i];
    }
    double average=(sum-min)/4;
    if(average<60)
        grade='F';
    else if(average<70)
        grade='D';
    else if(average<80)
        grade='C';
    else if(average<90)
        grade='B';
    else if(average<=100)
        grade='A';
    cout<<"Average of highest four is : "<<average<<endl;
    cout<<"Grade Obtained: "<<grade<<endl;
}

Output:

2.

#include<bits/stdc++.h>
using namespace std;
double classSum;
class Student{
    public: 
        string name,grade;
        int marks[5],min=999,sum=0;
        double average;
        
        void input(){
            cout<<"\n";
            for(int i=0;i<5;i++){
                cout<<"Marks in Test "<<i+1<<": "<<endl;
                cin>>marks[i];
                sum+=marks[i];
                if(min>marks[i]){
                    min=marks[i];
                }
            }
        }
        void calAvgOf(){
            average=(sum-min)/4;
            classSum+=average;
            
        }
        
        string gradeObtained(){
            if(average<60)
                grade='F';
            else if(average<70)
                grade='D';
            else if(average<80)
                grade='C';
            else if(average<90)
                grade='B';
            else if(average<=100)
                grade='A';
            return grade;
        }
        void display(){
            cout<<name<<" "<<grade<<endl;
        }

};
int main(){
    int numStudent;
    cout<<"Enter the number of Student in class:"<<endl;
    cin>>numStudent;
    Student s[numStudent];
    for(int i=0;i<numStudent;i++){
        cout<<"Name of the student: ";
        cin>>s[i].name;
        cout<<"Enter the "<<s[i].name<<" marks: ";
        s[i].input();
        s[i].calAvgOf();
        s[i].gradeObtained();
        cout<<"------------------------------------------------------------------------------\n";
    }
    cout<<"**********************************************************\n";
    cout<<"Class Average: "<<classSum/numStudent<<endl;
    for(int i=0;i<numStudent;i++){
        cout<<i+1<<". ";
       s[i].display();
    }
       
}

Output: