急求C++ 输入学生成绩，输出相应的成绩和等级（90-100为A级，80-89为B级，70-7

#include void main(){ int score; scanf("%d", &score); switch(score/10) { case 10: case 9: printf("A\n"); case 8: printf("B\n"); case 7: printf("C\n");