pass 2d array to function c++

To pass a 2D array to a function in C++, you can follow these steps:

  1. Declare the function prototype: Begin by declaring the function prototype, where you specify the function name, return type (if any), and the parameters. In this case, you will need to define the function to accept a 2D array as a parameter. The syntax for declaring a 2D array parameter is to include the size of the second dimension, but not the first dimension. For example:
void functionName(int array[][size]);
  1. Define the function: After declaring the function prototype, you need to define the function. In the function definition, you can access and manipulate the elements of the 2D array as needed. The syntax for defining a function that accepts a 2D array as a parameter is similar to the function prototype:
void functionName(int array[][size]) {
  // Function code
  1. Pass the 2D array to the function: To pass a 2D array to the function, you simply need to include the name of the array as an argument when calling the function. The array will automatically decay into a pointer to the first element of the array. For example:
void functionName(int array[][size]);

int main() {
  int myArray[3][3] = { {1, 2, 3}, {4, 5, 6}, {7, 8, 9} };
  return 0;

In the above example, we declare and initialize a 2D array myArray. Then, we pass myArray as an argument to the functionName function.

  1. Access elements in the function: Inside the function, you can access the elements of the 2D array using the array notation. For example:
void functionName(int array[][size]) {
  // Accessing elements
  int element = array[row][column];
  // Manipulating elements
  array[row][column] = newValue;

In the above example, array[row][column] represents the element at the specified row and column in the 2D array.

That's it! You have successfully passed a 2D array to a function in C++. Let me know if you have any further questions.