c++ - 存储大小未知

Question

const int MAXWIDTH = 512;
const int MAXHEIGHT = 512;

void readImage(int image[][MAXHEIGHT], int &width, int &height)

....

void writeImage(int image[][MAXHEIGHT], int width, int height)

....

int main ()
{
 int image[][MAXHEIGHT], width, height;

 readImage (image, &width, &height);
 writeImage (image, width, height);
 return 0;
}

我在 main 函数中不断收到““图像”的存储大小未知”，但不确定为什么。

Answer 1

除非使用初始化列表，否则在声明数组时不能执行 int image[][MAXHEIGHT];。即

int image[][5]={ {1,2,3,4,5},{6,7,8,9,10} };//is OK and the compiler get the row size from your initializer list and creates image[2][5]

int image[][5];//this is not OK because the compiler can't know the size of the row when creating the arrray

int image[MAXWIDTH][MAXHEIGHT];//OK because you specified both dimensions

在指定函数的形参时，可以保留二维数组的行维度，即

void somefunction(image[][MAXWIDTH])//is OK