project, C++ (gcc)

project

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

double grAv (double sum ,int i ){
 return sum/i;
        }

int main (){
char x;
    int i,j , ch;

cout<<"          >>>>> Student System <<<<<          "<<endl<<endl;

cout<<"Enter number of students : ";
    cin>>i;
    cout<<"Enter number of courses : ";
    cin>>j;

string arn[i];
int arc[i][j];
double arg [i] ;

do {

cout<<">>>>> Please choose a service : "<<endl;
cout<<">>>>> A- Add a student’s grade in a course."<<endl;
cout<<">>>>> B- Print grades for a certain course and the average of students’ grades in this course. "<<endl;
cout<<">>>>> C- Print the grade letter for all courses of a certain student."<<endl;
cout<<">>>>> D- Update the grade of a student in a certain grade."<<endl;
cout<<">>>>> E- Delete a certain mark for certain student."<<endl;
cout<<">>>>> F- Exit."<<endl;
cin>>x;

switch (x){
case 'A' :
case 'a' :
{cout<<"choose number of coruses  you  want to enter grades in :";
        cin>>ch;
for (int colm=0;colm<ch;colm++) {
        cout<<"Course #"<<colm+1<<":";
        for(int row=0;row<i;row++){
        cout<<"enter your grade for student "<<row+1<<":"<<endl;
        cin>>arc[row][colm];
        cout<<endl;}}
cout<<endl<<endl<<endl;}
break;

case 'B' :
case 'b' :
{
ch=0;
cout<<"choose number of the course to print the grade and avg :";
cin>>ch;
cout<<"the grades for #"<<ch<<" course is :"<<endl;
double sum=0.0;
int colm=ch-1;
for (int row=0;row<i;row++){
cout<<arc[row][colm];
sum+=arc[row][colm];
cout<<endl;}
cout<<"The average for course #"<<ch<<" is : "<< grAv (sum ,i);

cout<<endl<<endl<<endl;}
break;
case 'C' :
case 'c' :
{

cout<<"enter your name : ";
cin>>
}
cout<<"cccccccccccccccccccccccc"<<endl<<endl<<endl;
break;

case 'D' :
case 'd' :
cout<<"ddddddddddddddddd"<<endl<<endl<<endl;
break;
case'E':
case 'e':
cout<<"eeeeeeeeeeeeeeeee"<<endl<<endl<<endl;
case 'F':
case 'f':
cout<<"fffffffffffffffffff"<<endl<<endl<<endl;

}

} while (x!='f' && x!='F');

}


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