project, C++ (gcc)

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#include <iostream>
#include <cstring>
using namespace std;
int main (){
	char x;
	int i,j;
    cout<<"          >>>>> Student System <<<<<          "<<endl<<endl;
    
    cout<<"Enter number of students : ";
    cin>>i;
    cout<<"Enter number of courses : ";
    cin>>j;
    
    char arn[i]; 
	int arc[j];
	double arg [j] , avg ;
	
	do {
		
	cout<<">>>>> Please choose a service : "<<endl;
	cout<<">>>>> A- Add a new student."<<endl;
	cout<<">>>>> B- Show grades for a certain course and average. "<<endl;
	cout<<">>>>> C- Show grade letter for all courses for certain student."<<endl;
	cout<<">>>>> D- Update a student grade."<<endl;
	cout<<">>>>> E- Delete a grade for a student."<<endl;
	cout<<">>>>> F- Exit."<<endl;
	cin>>x;
	
	switch (x){
		case 'A' :
		case 'a' :
		cout<<"aaaaaaaaaaaaaaaaa"<<endl<<endl<<endl;
		break;
		
		case 'B' :
		case 'b' :
		cout<<"bbbbbbbbbbbbbbbbb"<<endl<<endl<<endl;
		break;
		
		case 'C' :
		case 'c' :
		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;
        break;
		case 'F':
	 	case 'f':
	 		break;
        default:
        cout<<"enter letter from the menue "<<endl<<endl<<endl;
		
	}
	
  } while (x!='f'&& x!='F');
	
}

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Compilation time: 0.53 sec, absolute running time: 10.1 sec, cpu time: 0 sec, memory peak: 0 Mb, absolute service time: 10,64 sec