Zhejiang version of "C Programming Language (3rd Edition)" title set exercises 3-4 student achievement statistics (15 points)

#include <stdio.h>
int main(void)
{
    int n, i, arr[1000];
    int a, b, c, d, e;
    scanf("%d", &n);
    a = b = c = d = e = 0;
    for (i = 0; i < n; i++)
    {
        scanf("%d", &arr[i]);
        if (arr[i] >= 90)
            a++;
        else if (arr[i] >= 80)
            b++;
        else if (arr[i] >= 70)
            c++;
        else if (arr[i] >= 60)
            d++;
        else
            e++;
    }
    printf("%d %d %d %d %d", a, b, c, d, e);
    return 0;
}