C++

please complete the below c++ code based on instructions below:

Most of the program is written. However, you need to create the functionality of taking the whole gradebook and finding the average across all students (rows) for each of the assignments (columns).

Hint: if you have nested loops to traverse the gradebook, you want to go through each ROW (student) before going onto the next COLUMN (assignments). Usually you've done it the other way around, but since we are averaging each column, the order needs to be different.

#include <iostream>

#include <vector> #include <string> using namespace std;

//Global constants... const int MAX_EXERCISES = 10; const int MAX_STUDENTS = 5;

//Function prototypes... vector < vector <double> > fillGradebook(int,int); int getNum(string,int); void display(vector <double> );

//Main program... int main() { int exercises=0; int students=0; vector < vector<double> > gradebook; vector <double> avgGrade;

exercises = getNum("exercises",MAX_EXERCISES); students = getNum("students",MAX_STUDENTS); gradebook = fillGradebook(students,exercises);    avgGrade = averageAssignment( gradebook ); // <-- IMPLEMENT FUNCTION FOR THIS    display(avgGrade);

return 0; }

vector < vector <double> > fillGradebook(int students, int exercises) { vector < vector<double> > grades; //make row for each student grades.resize(students);

for(int student=0; student < students; student++ ) { cout<<"Enter student "<<(student+1)<<"'s " <<exercises<<" grades: "; for(int exercise=0; exercise < exercises; exercise++) { //add a column for each student's grade double grade; cin>>grade; grades[student].push_back(grade); } } return grades; }

int getNum(string name,int maximum) { int count = 0; do { cout<<"How many "<<name<<" are there?"<<endl; cin>>count; if( count < 1 || count > maximum ) { cout<<"ERROR: Must be between 1-"<<maximum<<".\n"; } }while( count < 1 || count > maximum); return count; }

void display(vector <double> grades) { cout<<"===AVERAGE GRADES PER ASSIGNMENT===\n"; for(int i = 0; i < grades.size(); i++) { cout<<grades[i]<<" "; } cout<<endl; }