错误：for循环初始声明仅允许在C99模式下解决

我刚才拉了一段代码，我写了一会儿，我得到以下错误：错误：“为”循环初始声明只允许在C99模式我如何允许“C99模式”？谢谢。



      以下为原文

    I've just pulled in sum code i wrote a while back and i'm getting the following error:

error: 'for' loop initial declarations are only allowed in C99 mode

How do I allow "C99 mode"?



long power (long number, long order)
{
    long result = number;
    for (unsigned int n = 0; n < (order - 1); n++)
    {
        result = result * number;
    }

    if (order == 0)
    {
        result = 1;
    }
    return (result);
}



Thanks.