- #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";
- }