In C++, you can declare a 2-D array for matrix operations like A = B + C, where A, B, and C are matrices with 3 rows and 3 columns containing double-precision floating-point numbers, using the traditional 2-D array syntax. For matrix A, without initializing it, you would declare it as follows:
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double A[3][3];
This declaration creates a 2-dimensional array, A, with 3 rows and 3 columns, where each element of the array is of type double. Similar declarations would be made for matrices B and C if they are also 3x3 matrices of double-precision floating-point numbers.
在C++中，如果您需要進行矩陣操作，如A = B + C，其中A、B和C都是包含雙精度浮點數的3行3列的2維矩陣，您可以使用傳統的2維陣列語法來聲明。對於矩陣A，不初始化的聲明方式如下：
double A[3][3];
這樣的聲明創建了一個2維陣列A，有3行3列，其中每個元素的類型都是double。如果B和C矩陣也是3x3的雙精度浮點數矩陣，則會以類似的方式進行聲明。
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