Num 40 num 50 cout your grade is c endl else cout

cout << "dont be smart enter correct marks. " << endl;

}
else
{
switch (marks / 10)
{
case 9: //marks between 90-100
cout << "your grade is A+ or excellent. " << endl;
break ;
case 8: //makrs between 80-90
cout << "your grade is A- or very good. " << endl;
break ;
case 7: //makrs between 70-79
cout << "your grade is B+ or good " << endl;
break ;
case 6: //makrs between 60-69
cout << "your grade is B- or very fair " << endl;
break ;
case 5: //makrs between 50-59
cout << "your grade is C or fair " << endl;
break ;
case 4: //makrs between 40-49
cout << "your grade is D or bad" << endl;
break ;
default :
cout << "Your grade is F or You are fail..." << endl;
}
}
system( "pause" );
return 0;
}