📄 3_6.cpp
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#include <iostream.h>
void main()
{
int grade;
cout <<"please input a number:\n";
cin >>grade;
if(grade>100||grade<0)
cout <<"错误的成绩.\n";
else if(grade>=90)
cout <<"A.\n";
else if(grade>=80)
cout <<"B.\n";
else if(grade>=70)
cout <<"C.\n";
else if(grade>=60)
cout <<"D.\n";
else
cout <<"E.\n";
}
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