P53 3.6  # include<iostream.h>    void main()    {     float score;    cout<<"Please input a score:";    cin>>score;    if(score>=90)     cout<<"Grade A"<<endl;   else if(score>=80)     cout<<"Grade B"<<endl;   else if(score>=70)     cout<<"Grade C"<<endl;   else if(score>=60)     cout<<"Grade D"<<endl;   else      cout<<"Grade E"<<endl;   }  

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