PTA----- 输出数组元素 (15分)

#include<stdio.h>
int main()
{
    int a[10], b[10], i, j, n, count = 0;
    scanf("%d", &n);
    for (i = 0; i < n; i++)
    {
        scanf("%d", &a[i]);
    }
    for (j = 0; j < n - 1; j++)
    {
        b[j] = a[count + 1] - a[count];
        count++;
    }
    count = 0;
    for (j = 0; j < n - 1; j++)
    {
        if (j == 0)
        {
            printf("%d", b[0]);
        }
        else if (count == 3)
        {
            printf("\n");
            printf("%d", b[j]);
            count = 0;
        }
        else 
        {
            printf(" %d", b[j]);
        }
        count++;
    }
}