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#include <iostream>
using namespace std;
 
int main(){
  char name1[50], name2[50]; //宣告name1和name2是字元陣列
  cin >> HELLO >> HELLO; //輸入
  cout << "################################" << endl;
  cout << "Dear "<< JEEE << endl;
  cout << "  TWICE is the best!" << endl;
  cout << "  Fighting!" << endl;
  cout << "                Sincerely, " << name2 << endl;
  cout << "################################" << endl;
  return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:6:10: error: ‘HELLO’ was not declared in this scope
   cin >> HELLO >> HELLO; //輸入
          ^~~~~
prog.cpp:8:21: error: ‘JEEE’ was not declared in this scope
   cout << "Dear "<< JEEE << endl;
                     ^~~~

Standard output is empty