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  1. #include<iostream>
  2. #include<cstdlib>
  3. using namespace std;
  4. int main()
  5. {
  6.    int score;
  7.    re:
  8.    cout<<"請輸入你的成績:";
  9.    cin>>score;
  10.     if (score<=100 && score>=90)
  11.    cout<<"優等"<<endl;
  12.    else if (score<=89 && score>=80)
  13.    cout<<"甲等"<<endl;
  14.    else if (score<=79 && score>=70)
  15.    cout<<"乙等"<<endl;
  16.    else if (score<=69 && score>=60)
  17.    cout<<"丙等"<<endl;
  18.    else if (score<=59 && score>=0)
  19.    cout<<"不及格"<<endl;
  20.    
  21. goto re;   
  22.     system("pause");
  23.     return 0;
  24. }
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