C$++$ modify these classes and write a driver program that combines them

GradeBook.h:

$//$ GradeBook class definition in a separate file from main so that we may use this in all the programs now

#include

#include $//$ class GradeBook uses C$++$ standard string class

$//$ GradeBook class definition

class GradeBook

$\{$

public:

$//$ constructor initializes courseName with string supplied as argument

$$ explicit GradeBook$($ std::string name $)$

$$ : courseName$($ name $)//$ member initializer to initialize courseName

$\{$

$//$ empty body

$\}//$ end GradeBook constructor

$//$ function to set the course name

$$ void setCourseName$($ std::string name $)$

$\{$

$$ courseName $=$ name; $//$ store the course name in the object

$\}//$ end function setCourseName

$//$ function to get the course name

$$ std::string getCourseName$()$ const

$\{$

$$ return courseName; $//$ return object's courseName

$\}//$ end function getCourseName

$//$ display a welcome message to the GradeBook user

$$ void displayMessage$()$ const

$\{$

$//$ call getCourseName to get the courseName

$$ std::cout $<<$ "Welcome to the grade book for

$"<<$ getCourseName$()$

$<<"!"<<$ std::endl;

$\}//$ end function displayMessage

$$ void determineClassAverage$()$ const; $//$ averages user$-$entered grades

private:

$$ std::string courseName; $//$ course name for this GradeBook

$\}$; $//$ end class GradeBook

week$4$ program.cpp:

#include

#include

using namespace std;

void sort$($char nm$[][10])$;

void display$($char name$[][10])$;

int main$()\{$

char names$[10][10]$;

int i;

for $($i$=0$; i$<10$; i$++)$

$\{$

cout $<<$ "Enter name of the student : $"$;

cin $>>$ names$[$i$]$;

$\}$

sort$($names$)$;

display$($names$)$;

return $0$;

$\}$

void sort$($char nm$[][10])\{$

char temp$[10]$;

cout $<<$"Sorting names in Ascending Order $"<<$ endl;

for $($int i $=0$; i $<10$; $++$i$)$

for $($int j $=$i$+1$; j$<10$; j$++)$

$\{$

if $($strcmp$($nm$[$i$],$nm$[$j$])>0)$

$\{$

strcpy$($temp$,$nm$[$i$])$;

strcpy$($nm$[$i$],$nm$[$j$])$;

strcpy$($nm$[$j$],$temp$)$;

$\}$

$\}$

$\}$;

void display$($char nm$[][10])\{$

cout $<<$"Displaying names in Ascending Order $"<<$ endl;

for $($int i $=0$; i $<10$; $++$i$)$

$\{$

cout$<<$ nm$[$i$]<<""<$