Cs, C# - rextester

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#include <iostream>
#include <string.h>
using namespace std;

// Amjad Alqarni, shrooq Alharbi, Hanan Bolaqi 
//Group 2

double avg(double sum, int n){

double avg=sum/n;
return avg;
	
}

int main() 
{
	
	int n,m, s,i=1,t=0,k=0; 
	cout<<"Enter the size of student array"<<endl;
	cin>>n;
	cout<<"Enter the size of course array"<<endl;
	cin>>s;
	
	string name [n];
	int course [s];
	int grade [n][s];
	
	for (int r=0 ; r<n; ++r)
	{
	
		cout<<"enter name of student #"<<r+1<<" "<<endl;
	cin>>name[r];
    }
	for ( t=0; t<n ;++t)
		for(k=0;k<s;++k)
	{
		
    	cout<<"enter grade of "<<name [t]<<" for course #"<<k+1<<" "<<endl;
	    cin>>grade [t][k];
	}

do
    {
    cout<<"enter the number of your choose from the Menu: ";
    cout<<"\n1. Add a student’s grade in a course."; 
	cout<<"\n2. Print grades for a certain course and the average of students’ grades in this course. ";
	cout<<"\n3. Print the grade letter for all courses of a certain student. ";
	cout<<"\n4. Update the grade of a student in a certain grade. ";
	cout<<"\n5. Delete a certain mark for certain student ";
	cout<<"\n6. Exit"<<endl;
	 cin>>m;
    
    
switch(m)
{
	case 1:
		break;
		
		
	case 2:	
	{
	int i=0;
	double sum=0.0;
	cout<<"Enter the index for the certain course"<<endl;
	cin>>i;
	cout<<"Grades in this course"<<endl;
	for(int r=0; r<n; r++)
	{
	sum+=grade [r][i];
	cout<<grade[r][i];
	cout<<endl;
    }
    
    cout<<"The avrage is ";
	cout <<avg(sum, n)<<endl;
	break;	
    }
    
    case 3:
    	{
		
    	int i,sums=0.0;
    	double avrg;
    	//. Print the grade letter for all courses of a certain student. 
    	cout<<"Enter the index for the certain student "<<endl;
	    cin>>i;
	    for(int x=0;x<s;x++)
		{
			sums+=grade[i][x];
				
		}
		avrg=sums/s;
		if (avrg>=90)
		cout<<"the grade letter"<<" "<<"A"<<endl;
		else if (avrg>=80)	
			cout<<"the grade letter"<<" "<<"B"<<endl;	
		else if(avrg>=70)
			cout<<"the grade letter"<<" "<<"C"<<endl;
		else if (avrg>=60)
			cout<<"the grade letter"<<" "<<"D"<<endl;
		else
			cout<<"the grade letter"<<" "<<"F"<<endl;
			break;
		}
		
		case 4:
			break;
		case 5:
			break;
		case 6 :
			break;
			
	}
		}while(m!=6);

}

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