Question

Using the following parallel array and array of vectors:

// may be declared outside the main function
const int NUM_STUDENTS =3; 

// may only be declared within the main function

string Students[NUM_STUDENTS] = {"Tom","Jane","Jo"};
vector <int> grades[NUM_STUDENTS] {{78,98,88,99,77},{62,99,94,85,93}, {73,82,88,85,78}};

Write a C++ program to run a menu-driven program with the following choices:

1) Display the grades
2) Add grade
3) Remove grade for all students for a selected assignment
4) Display Average for each student
5) Display the name of the student with the lowest grade for each assignment
6) Display a sorted list of the average scores of students
7) Quit

Make sure your program conforms to the following requirements:

1. Write a function called getValidGrade that allows a user to enter in an integer and loops until a valid number that is>= 0 and <= 100 is entered. It returns the valid value.

2. Write a function called getValidAssignmentNumber that takes in as a parameter the max number of assignments and allows a user to enter in an integer and loops until a valid number that is>= 1 and <= the max number of assignments. It returns the valid value.

3. Write a function called displayGrades that takes the student array and grade vector as parameters and displays the grades in the format in the sample run below.

4. Write a function called AddGrades that takes the student array and grade vector as parameters, it loops through each student, allows the user to enter in a valid grade for that student and stores the grade under the appropriate student in the grades vector.

5. Write a function called RemoveGrades that takes the student array and grade vector as parameters, it asks the user for a valid assignment number, loops through each student, and removes the selected assignment from each student's grades vector.

6. Write a function called displayAverageForEachStudent that takes the student array and grades vector as parameters, computes the average grade for each student, and displays the grades in the format in the sample run below.

7. Write a function called displayStudentNameLowestScoreEachAssign that takes the student array and grades vector as parameters, loops through each assignment and displays the name of the student with the lowest grade on that assignment in the format in the sample run below.

8. Write a function called displaySortedAverageForEachStudent the student array and grades vector as parameters, it creates a local copy of the student array and a new array of float values that stores the average for each student, it then sorts these two parallel arrays by the average and displays a list containing the names of the students and their averages in ascending order

9. Add comments wherever necessary.

Answer 1

OUTPUT FORMAT IS NOT MENTIONED

C++ Code:

#include<iostream>
#include<bits/stdc++.h>
using namespace std;
//Number of Students
const int NUM_STUDENTS=3;
//Number of Assignments
const int max_number=2;
//this function will return a valid grade
int getValidGrade(){
   int n;
   do{
       cout<<"Enter Valid Grade\n";
       cin>>n;
   }while(n>100 || n<0);
   return n;
}
//this function will return a valid assignemnt number
int getValidAssignmenNumber(int max_n){
   int n;
   do{
       cout<<"Enter Valid Assignment Number\n";
       cin>>n;
   }while(n>max_n||n<0);
   return n;
}
//This will display all grades of students
void displayGrades(vector<int> grade[],string student[]){
   cout<<"Student"<<"\t"<<"Grade"<<endl;
   for(int i=0;i<NUM_STUDENTS;i++){
       cout<<student[i]<<"\t"<<"Grades : ";
       for(int j=0;j<grade[i].size();j++){
           cout<<" "<<grade[i].at(j);
       }
       cout<<endl;
   }
}
//this will add grades to grade vector
void addGrades(vector<int> grade[],string student[]){
   for(int i=0;i<NUM_STUDENTS;i++){
       cout<<"Enter grade for "<<i+1<<" students:"<<endl;
       for(int j=0;j<max_number;j++){
           grade[i].push_back(getValidGrade());
       }
   }
  
}
//This will remove grades of specific assignment
void removeGrades(vector<int> grade[],string student[]){
   int r=getValidAssignmenNumber(max_number)-1;
   vector<int>::iterator it1;
   for(int i=0;i<NUM_STUDENTS;i++){
       int t=r;
       it1=grade[i].begin();
       while(t--){
           it1++;
       }
       grade[i].erase(it1);
   }
}
//this will display average of all grades of each students
void displayAverageForEachStudent(vector<int> grade[],string student[]){
   float sum=0.0;
   for(int i=0;i<NUM_STUDENTS;i++){
       for(int j=0;j<grade[i].size();j++){
           sum+=grade[i].at(j);
       }
       cout<<"Student Name :"<<student[i]<<" Average="<<(sum/grade[i].size())<<endl;
       sum=0.0;
   }
}
//This will show least scorer of each assignment
void displayStudentNameLowestScoreEachAssign(vector<int> grade[],string student[]){
   int low[max_number]={0};
   for(int i=1;i<NUM_STUDENTS;i++){
       for(int j=0;j<grade[i].size();j++){
           if(grade[i].at(j)<grade[low[j]].at(j))
               low[j]=i;
       }
   }
   for(int i=0;i<grade[i].size();i++){
       cout<<"Assignment number:"<<i+1<<"\t Student Name:"<<student[low[i]]<<endl;
   }
}
//This will show average marks of students in sorted manner
void displaySortedAverageForEachStudent(vector<int> grade[],string student[]){
   cout<<"Students"<<"\t"<<"Average Grades"<<endl;
   float sum=0.0;
   float averageSum[NUM_STUDENTS];
   for(int i=0;i<NUM_STUDENTS;i++){
       for(int j=0;j<grade[i].size();j++){
           sum+=grade[i].at(j);
       }
       averageSum[i]=(float)(sum/grade[i].size());//Average storing
       sum=0.0;
   }
   float min=0;
   int n=NUM_STUDENTS;
   //Sort logic
   for(int i=0;i<n-1;i++){
       for(int j=0;j<n-i-1;j++){
           if(averageSum[j]>averageSum[j+1]){
               float t=averageSum[j];
               averageSum[j]=averageSum[j+1];
               averageSum[j+1]=t;
               //also sort student array
               string temp=student[j];
               student[j]=student[j+1];
               student[j+1]=temp;
           }
       }
   }
   for(int i=0;i<n;i++){
       cout<<"Students: "<<student[i]<<"\t Avg Grades: "<<averageSum[i]<<endl;
   }
  
}
int main(){
   string Students[NUM_STUDENTS]={"Tom","Jane","Joe"};//Students array
   vector<int> grade[NUM_STUDENTS];//array of vectors
   int choice;
   cout<<"Enter Choice"<<endl;
   cout<<"1 for Display the grades\n2 for Add grade\n3 for Remove grade for all students for a selected assignment\n4 for Display Average for each student\n5 for Display the name of the student with the lowest grade for each assignment\n6 for Display a sorted list of the average scores of students\n7 for Quit\n";
   cin>>choice;
   //Menu driven Programme
   while(1){
       switch(choice){
           case 1:
               displayGrades(grade,Students);
               break;
           case 2:
               addGrades(grade,Students);
               break;
           case 3:
               removeGrades(grade,Students);
               break;
           case 4:
               displayAverageForEachStudent(grade,Students);
               break;
           case 5:
               displayStudentNameLowestScoreEachAssign(grade,Students);
               break;
           case 6:
               displaySortedAverageForEachStudent(grade,Students);
               break;
           case 7:
               choice=7;
               break;
       }
       //Breaking condition
       if(choice==7)
               break;
           else{
               cout<<"Enter Choice"<<endl;
               cout<<"1 for Display the grades\n2 for Add grade\n3 for Remove grade for all students for a selected assignment\n4 for Display Average for each student\n5 for Display the name of the student with the lowest grade for each assignment\n6 for Display a sorted list of the average scores of students\n7 for Quit\n";
               cin>>choice;
           }      
   }
   return 0;  
}

OUPUT:

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