void is_Perfectnumber(int number) //判斷完數並輸出
{
    int i = 0;
    int j = 0;
    int sum = 0;
    int arr[100] = { 0 };//定義一個數組，儲存因子
    for (i = 1; i <= number/2; i++) //判斷完數
    {
        if (0 == number % i)
        {
            arr[j] = i;
            j++;
            sum = sum + i;
        }
    }
    if (number == sum
 
)
    {
        printf("%3d its factors are ",sum);
        int k = 0;
        for (k = 0; k < j; k++)  //輸出完數的各個因子
        {
            printf("%d ", arr[k]);
        }
        printf("\n");
    }
}

int main()
{
    int num = 0;
    for (num = 1; num <= 1000; num++)
    {
        is_Perfectnumber(num);
    }
    system("pause"
 
);
    return 0;
}