#include<stdio.h> int main() { double score; char grade; scanf("%lf",&score); switch((int)(score/10)) {case10: case 9:grade='A';break; case 8:grade='B';break; case 7:grade='C';break; case 6:grade='D';break; case 5: case 4: case 3: case 2: case 1: case 0:grade='E'; } printf("成绩是%5.lf%,相应的等级是%c\n",score,grade); return 0;}