Lära Passing Static Array as an Argument of the Function

Pass a 1-Dimensional Array as an Argument

To pass a 1-dimensional array to a function, place [] after the parameter name in the function signature.

main.cpp


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#include <iostream>

// Function to process a 1-dimensional static array
void process(int arr[], const int size)
{
    for (int i = 0; i < size; ++i)
        std::cout << arr[i] << " "; // Print each element of the array
    
    std::cout << std::endl;
}

int main()
{
	const int SIZE = 5;
    // Initialize a 1-dimensional static array
    int oneDimArray[SIZE] = {1, 2, 3, 4, 5}; 

    // Call the function to process the array
    std::cout << "Original Array: ";
    process(oneDimArray, SIZE); 
}

Pass a 2-Dimensional Array as an Argument

Passing a 2D array to a function works similarly to passing a 1D array — you use [][] after the parameter name.

However, there is an important difference: in C++, you cannot declare a function parameter as datatype arrayName[][] without specifying at least one dimension. You must define the number of columns (or one dimension) so the compiler can correctly calculate memory offsets when accessing array elements.

main.cpp


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#include <iostream>

// Function to print a 2D array with a fixed number of columns
void process(int matrix[][3], const int rows) 
{
    // Loop through rows
    for (int i = 0; i < rows; ++i)
    {   
        for (int j = 0; j < 3; ++j)              // Loop through columns
            std::cout << matrix[i][j] << " ";    // Print each element
        
        std::cout << std::endl; // Move to the next line
    }
}

int main() 
{
    const int ROWS = 2;
    int arr[ROWS][3] = {{1, 2, 3}, {4, 5, 6}};

    std::cout << "Original Matrix:" << std::endl;
    process(arr, ROWS);  // Pass array and row count to the function
}

Since we need to specify at least one of the array dimensions (it doesn’t matter which), the signature of this function can also look like this:

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 2. Kapitel 4

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Suggested prompts:

Can you show an example of passing a 1D array to a function?

Can you provide a sample function signature for a 2D array?

Why do we need to specify one dimension when passing a 2D array?

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Pass a 1-Dimensional Array as an Argument

To pass a 1-dimensional array to a function, place [] after the parameter name in the function signature.

main.cpp


              123456789101112131415161718192021
            
#include <iostream>

// Function to process a 1-dimensional static array
void process(int arr[], const int size)
{
    for (int i = 0; i < size; ++i)
        std::cout << arr[i] << " "; // Print each element of the array
    
    std::cout << std::endl;
}

int main()
{
	const int SIZE = 5;
    // Initialize a 1-dimensional static array
    int oneDimArray[SIZE] = {1, 2, 3, 4, 5}; 

    // Call the function to process the array
    std::cout << "Original Array: ";
    process(oneDimArray, SIZE); 
}

Pass a 2-Dimensional Array as an Argument

Passing a 2D array to a function works similarly to passing a 1D array — you use [][] after the parameter name.

main.cpp


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#include <iostream>

// Function to print a 2D array with a fixed number of columns
void process(int matrix[][3], const int rows) 
{
    // Loop through rows
    for (int i = 0; i < rows; ++i)
    {   
        for (int j = 0; j < 3; ++j)              // Loop through columns
            std::cout << matrix[i][j] << " ";    // Print each element
        
        std::cout << std::endl; // Move to the next line
    }
}

int main() 
{
    const int ROWS = 2;
    int arr[ROWS][3] = {{1, 2, 3}, {4, 5, 6}};

    std::cout << "Original Matrix:" << std::endl;
    process(arr, ROWS);  // Pass array and row count to the function
}

Since we need to specify at least one of the array dimensions (it doesn’t matter which), the signature of this function can also look like this:

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 2. Kapitel 4