Project, C++ (vc++)

Project

//Abeer alwafi & Salha alfar & Fizah 
#include <iostream>
#include <cstring>
using namespace std;

int sum=0;
double avg=0.0;

int main()
{
//  The  N_Student mean the number of student
	int N_Student;
	cout<<"Enter number of students\n";
	cin>> N_Student;
	string studentName[ N_Student];
	for(int i=0;i<N_Student;i++)
	{
	cout<<"\n Enter the name of student #"<<i+1<<"\n";	
	cin>>studentName[i];
    }
//  The  N_Course mean the number of courses 
    int N_Course;
    cout<<"\nEnter number of courses\n";
    cin>>N_Course;
	string courses[ N_Course];
	for(int i=0;i<N_Course;i++)
	{
		cout<<"\n Enter your courses #"<<i+1<<"\n";
		cin>>courses[i];
		
	 }

int StudentGrade[N_Student][N_Course];
	int choice;
    do{
    string menue=" 1.Add a students grade in a course.\n\n 2.Print grades for a certain course and the average of students’ grades in this course.\n\n 3.Print the grade letter for all courses of a certain student.\n\n 4.Update the grade of a student in a certain grade.\n\n 5.Delete a certain mark for certain student.\n\n 6.Exit.\n\n";
    cout<<"\n\n\n The menue for students system \n\n\n\n"<<menue;

//  choice mean the number to choose from the menue
    cout<<"\n Enter your choice\n";
	cin>>choice;
switch(choice)
{case 1:
//  the row mean the name of student and the col mean the courses
     for(int row=0;row<N_Student;row++)
     {
    	for(int col=0;col<N_Course;col++){
    	cout<<"\n Enter \t "<<studentName[row]<<" grade in a course \t "<<courses[col]<<"\n";
    	cin>>StudentGrade[row][col];  	
     }
       
	 }
	 
	     break;
case 2:
//  global int sum=0;
	 int course;
	 cout<<"\n courses: ";
	 for(int col=0;col<N_Course;col++){
     cout<<"\n"<<col+1<<" "<<courses[col];
	 }
	 cout<<"\n Please choose the course from the list above \n";
     cin>>course;
     if ((course <1) && (course > N_Course)) 
     cout<< "\n Invalid course number";
else 
     {
//  the row mean the name of student and the course mean the courses user choose
     cout<< courses[course]<<"\n";
     
     for(int row=0;row<N_Student;row++){
    	cout<<StudentGrade[row][course]<<"\n";
    	sum = sum + StudentGrade[row][course];
     }
       cout<<"\n ------------------------\n";
//  global double avg=0.0; 
	   avg=sum/ N_Student;
	   cout<<"\n The avrage = \t"<<avg;
     }
	     break;
case 3:
	 
	     break;
case 4:
    
 	     break;	
case 5:

break;
 case 6:	 
	
         break;
default:
	cout<<"Invalid";
	 	
     }
}while(choice!=6);
 return 0;   
}


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