C语言解答

int main(int argc, const char * argv[]) {
    int score[100];
    int i;
    int countA = 0;
    int countB = 0;
    int countC = 0;
    int countD = 0;
    for (i = 0; i < 100; i++) {
    //    scanf("%d",&score[i]);
        score[i] = -1;
    }
    for (i = 0; i < 100; i++) {
        scanf("%d",&score[i]);
    }
    i = 0;
    while (score[i] != -1) {
        if ((score[i]>=85) && (score[i]<=100)) 
            countA ++;
        else if ((score[i]>=75) && (score[i]<=84))
            countB ++;
        else if ((score[i]>=60) && (score[i]<=74))
            countC ++;
        else
            countD ++;
          i++;
    }
    

    printf("A:%d\nB:%d\nC:%d\nD:%d\n",countA,countB,countC,countD);
}