C#代码问题
本帖最后由 CJavaer 于 2013-07-16 18:06:11 编辑 斜体indices = new int[1]处，我不明白，为什么要new一个，
粗体indices=new int[count];我知道怎么回事，
但是斜体的代码块只用到indices[0]啊，刚接触不太懂，请高手指教

//函数Maxima
        static int Maxima(int[] integers, out int[] indices)
        {
            Debug.WriteLine("Maximum values search started.");
            indices=new int[1];
            int maxVal=integers[0];
            indices[0]=0;
            int count = 1;
            Debug.WriteLine(string.Format("Maximum values initialised to {0},at element index 0.", maxVal));
            for (int i = 1; i < integers.Length; i++)
            {
                Debug.WriteLine(string.Format("Now looking at element at index{0}",i));
                if (integers > maxVal)
                {
                    maxVal = integers[i];
                    count = 1;
                    [i]indices = new int[1];
                    indices[0] = i;
                    Debug.WriteLine(string.Format("Now maximun found,Now value is {0},at element index{1}", maxVal, i));
                }
                else
                { 
 
                    if (integers[i] == maxVal)
                    {
                        count++;
                        int[] oldIndices = indices;
                        indices=new int[count];
                        oldIndices.CopyTo(indices,0);
                        indices[count-1]=i;
                        Debug.WriteLine(string.Format("Duplicate maximum found at element index {0}",i));
                    }
                }
            }
            Trace.WriteLine(string.Format("Maximum value {0} found,with {1} occurrences",maxVal,count));
            Debug.WriteLine("Maximum values search completed.");
            return maxVal;
        }

//主程序
            int[] testArray = { 4, 7, 4, 2, 7, 3, 7, 8, 3, 9, 1, 9 };
            int[] maxValIndices;
            int maxVal = Maxima(testArray, out maxValIndices);
            Console.WriteLine("Maximum value {0} found at element indices:",maxVal);
            foreach (int index in maxValIndices) 
 
            {
                Console.WriteLine(index);
            }
            Console.ReadKey();

[解决办法]
indices=new int[1];
indices[0]=0;
其实就是
indices = { 0 };

因为是out修饰的参数，所以必须函数自己去初始化。
[解决办法]

引用:

Quote: 引用:

indices=new int[1];
indices[0]=0;
其实就是
indices = { 0 };

因为是out修饰的参数，所以必须函数自己去初始化。

你好，谢谢你的解答，indices在for循环外面不是初始化了么，
为什么在for循环里面if中还要初始化呢
if (integers[i] > maxVal)
{
maxVal = integers[i];
count = 1;
indices = new int[1];
indices[0] = i;
Debug.WriteLine(string.Format("Now maximun found,Now value is {0},at element index{1}", maxVal, i));
}

这里面的初始化的原因是因为indices数值变化了，需要扩展数组么
if (integers[i] == maxVal)
{

count++;
int[] oldIndices = indices;
indices=new int[count];
oldIndices.CopyTo(indices,0);
indices[count-1]=i;
Debug.WriteLine(string.Format("Duplicate maximum found at element index {0}",i));
}

开始indices长度只有一个，后面数组长度变长了。具体要看代码的逻辑了。

[解决办法]
for循环有可能不执行，只在for里初始化，会有编译错误提示。