Passing two-dimensional arrays as parameters in Functions

First, void f (a [] []); is incorrectly defined.

When two-dimensional data is used as a function parameter, you must specify the number of columns in the two-dimensional array so that the compiler can understand how to address it.

The correct method is void f (a [4] [6]).

Void f (a [] [6]); // The number of rows in a two-dimensional array can be omitted.

In addition, a two-dimensional array cannot be defined as its subscript with a very large number.

Void f (a [m] [N]); is a serious error;

Correct Application Mode 1

Void func1 (INT iarray [] [10])
{

}

Int main ()
{
Int array [10] [10];
Func1 (array );

}

Correct Application Mode 2 (using a one-dimensional pointer array as a parameter)

Void func2 (int
(* Parray) [10])
{

}

Void func2_1 (INT (* parray) []) // The code is compiled and cannot be called.
{

}

Int main ()
{
Int array [10] [10];
Func2 (array );
}

Correct Application Mode 3 (using two-dimensional array references as parameters)

Void func3 (INT (& parray) [10] [10]) // two dimensions must be specified here
{

}

Int main ()
{
Int array [10] [10];
Func3 (array );
}

Correct Application Mode 4 (using a two-dimensional pointer array as a parameter)

Void func4 (INT (* parray) [10] [10]) // you must specify two dimensions.
{

}

Int main ()
{
Int array [10] [10];
Func4 (& array );

}

Note: The above four methods are common, but when the array is passed, only the value is passed, and the input parameter is not changed.

Supplement: When the double pointer is used as the form parameter, the passed real parameter must also be a double pointer, cleverly allocating memory space using new, which can be defined with a very large volume

Void func5 (INT ** parray, int M, int N)
{

}

# Include <ctime>
Int main ()
{
Int M = 10;
Int n = 10;

Int ** parray = new int * [m];
Parray [0] = new int [M * n];
// Allocate continuous memory and dynamically create two-dimensional arrays

// Parray [1] [0] cannot be used for addressing. You must specify the subscript addressing mode.
For (INT I = 1; I <m; I ++)
{
Parray [I] = parray [I-1] + N;
}

Func5 (parray, m, n );
}