What is the order in which two-dimensional array elements are stored in memory in C language?

In the C language, two-dimensional array elements are stored in rows in memory. Two-dimensional array A[m][n], which is a two-dimensional array with m rows and n columns; assuming a[p][q] is the first element of A, it can be stored according to "row priority" or "Column major" storage is used to calculate the address of element a[i][j].

In the C language, two-dimensional array elements are stored row by row in memory.

Two-dimensional array A[m][n], which is a two-dimensional array with m rows and n columns. Let a[p][q] be the first element of A, that is, the row subscripts of the two-dimensional array are from p to m p, and the column subscripts are from q to n q. When stored in "row-major order", the element a[i The address of ][j] is calculated as:

LOC(a[i][j]) = LOC(a[p][q]) ((i − p) * n (j − q)) * t;

When stored in "column-major order", the address is calculated as:

LOC(a[i][j]) = LOC(a[p][q]) ( (j − q) * m (i − p)) * t;

The minimum number of units required to store this array is (m-p 1) * (n-q 1) * t bytes.

Extended information

C Dynamic two-dimensional array:

Take integer as an example, row is the number of rows , col is the number of columns

int **data;//Storage pointer of two-dimensional array (pointer to pointer. The address of date=x[0][0]. This marking will be better. Because sizeof The (date) result is 4 and it is impossible to store a two-dimensional array).

//以下实现如何申请内存 data = new int *[row]; for (int k = 0; k < row; k++) { data[k] = new int[col]; } //赋值跟普通二维数组一样 例如 data[0][0] = 5; //将二维数组1行1列（C++中称为0行0列）赋值为5 //删除内存 for (int i = 0 ; i < row; ++i) { delete [] data[i]; //此处的[]不可省略 } delete [] data;

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