3-4. 成绩转换(15)

#include <stdio.h>int main(){int a;scanf("%d",&a);const int A = 90;const int B = 80;const int C = 70;const int D = 60;if(a < A){if(a < B){if(a < C){if(a < D){printf("E\n");}else{printf("D\n");}}else{printf("C\n");}}else{printf("B\n");}}else{printf("A\n");}return 0;}