#include <iostream> using namespace std;int main() {int score;//從鍵盤(pán)上輸入分?jǐn)?shù)cout<<"score=";cin>>score;//用帶else if的條件語(yǔ)句判斷處理if (score<0 || score>100) {cout<<"The score is out of range!"<<endl;}else if (score>=90) cout<<"Your grade is a A."<<endl;else if (score>=80) cout<<"Your grade is a B."<<endl;else if (score>=70) cout<<"Your grade is a C."<<endl;else if (score>=60) cout<<"Your grade is a D."<<endl;else cout<<"Your grade is a E."<<endl; }

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