#include <iostream>
using namespace std;
int main() {
char grade = 'A';
switch (grade) {
case 'A':
cout << "عالی!" << endl;
case 'B':
cout << "خوب!" << endl;
case 'C':
cout << "متوسط!" << endl;
break;
default:
cout << "نامعتبر!" << endl;
}
return 0;
}
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