题解 | #小乐乐转换成绩#

#include <stdio.h>
int main() {
	int n = 0;
	scanf("%d", &n);
	int c = n / 10;
	if (n >= 0 && n <= 100){
		switch (c) {
		case 9:
		case 10:
			printf("A\n");
			break;
		case 8:
			printf("B\n");
			break;
		case 7:
			printf("C\n");
			break;
		case 6:
			printf("D\n");
			break;
		case 5:
		case 4:
		case 3:
		case 2:
		case 1:
		case 0:
			printf("E\n");
			break;
		default:
			printf("F\n");
			break;
		}
	}
	else{ printf("F\n"); }


return 0;
}