Question

Write a C++ program that reads a students name followed by 7 numeric grades from a file.  Compute the average grade after dropping the  lowest grade.   Assign letter grades via this scale .Please show steps in the comments .

A 90 – 100

B 80  --89

C 70 –79

D 60 -69

F 0  - 59

Input format:

Sam 100 90 87 23 12 67 95

Mary 30 20 90 90 90 90 88

Mark 80 90 80 80 90 87 100

End of file

                                                              REPORT

   Name                                                                                             Grade

      Sam                                                                                                 C

      Mary                                                                                                A

       Mark                                                                                               B

The student with the highest average is   Mary   (99.99)

The student with the lowest average is     Sam    (99.99)

Answer 1

C++ program to find average, total and grade

Steps:

• Enter the numbers of students detail like to enter
• Collect the seven subject marks
• Find total, average and grade

Source code

#include<iostream> 
 #include<conio.h> 
 using namespace std;
 int main ( ) 
 {   
     // define struct and decide the number of subjects
             struct student 
          { 
               int subject1 ; 
               int subject2 ; 
               int subject3 ; 
               int subject4 ;
               int subject5 ;
               int subject6 ;
               int subject7 ;
               
          }; 
        // define number of students markes have to be collected
                int i , n, total; 
                float av ; 
                 
                struct student st[20]; 
                char name[20];
                cout<<" \n Enter the Number of Students marks wish to enter : " ; 
                cin>> n ; 
                for (i =0; i<n; i++) 
                    { 
                        // Collecting the basic details
                        cout<<"Enter the name of Student: ";
                        cin>>name;
                           cout<<"\nEnter the Marks of seven Subjects : " ; 
                           total = 0 ; 
                           cin>> st[i].subject1 >>st[i].subject2>>st[i].subject3>>st[i].subject4>>st[i].subject5>>st[i].subject6>>st[i].subject7; 
                           total = st[i].subject1+st[i].subject2+st[i].subject3+st[i].subject4+st[i].subject5+st[i].subject6+st[i].subject7; 
                           av = (float) total /7 ; 
                           cout<<"Total mark is :"<<total;
                           cout<<"\nAVERAGE Marks of  the Student is : "<< av ; 
                           cout<<"\nYour Grade is :: ";
                         
                          // define the conditions of grade
        if(av>89)
        {
                cout<<"[ A ]\n";
        }
        else if(av>79 && av<=89)
        {
                cout<<"[ B ]\n";
        }
        else if(av>69 && av<=79)
        {
                cout<<"[ C ]\n";
        }
        else if(av>59 && av<=69)
        {
                cout<<"[ D ]\n";
        }
        else
        {
            cout<<"[ F ]\n";
        }
        
                     } 
                           
                           return 0;
 }

The output: