#include<stdio.h>
int main(void)
{
    int i,n,A,B,C,D,E,sum;
    A=B=C=D=0;

    scanf("%d%d%d%d%d%d%d",&sum,&sum,&sum,&sum,&sum,&sum,&sum);
   
    if(sum>=90&&sum<=100){
        A++;
        printf("%d\n",A);}
    else if(sum<=89&&sum>=80){
        B++;
        printf("%d\n",B);    }
    else if(sum<=79&&sum>=70){
        C++;
        printf("%d\n",C);}
             else if(sum<=69&&sum>=60){
                 D++;printf("%d\n",E);
             }
             else E++;        
    return 0;
 }
请问为什么结果都是0？？