How to Programmatically Insert Values into a Two-Dimensional Array?

What is the method to programmatically insert values into a two-dimensional array?

// Example in Python
rows, cols = 3, 3
array_2d = [[0]*cols for _ in range(rows)]

# Insert values
for i in range(rows):
    for j in range(cols):
        array_2d[i][j] = i * j

Inserting values into a two-dimensional array involves specifying the dimensions of the array and then populating it with data via indexing. This process can be accomplished in various programming languages, each having its syntactic structure.

// Example in Java
int rows = 3;
int cols = 4;
int[][] array2D = new int[rows][cols];

// Insert values
for (int i = 0; i < rows; i++) {
    for (int j = 0; j < cols; j++) {
        array2D[i][j] = i + j; // Example value
    }
}

Causes

• Lack of understanding of multidimensional arrays
• Not knowing how to index arrays correctly
• Inadequate knowledge of the programming language syntax

Solutions

• Define the dimensions of the array before insertion.
• Use nested loops to iterate through rows and columns.
• Assign values using the appropriate syntax based on the programming language.

Mistake: Using the wrong index when inserting values.

Solution: Always ensure that the indices are within the bounds of the array dimensions.

Mistake: Not initializing the array before insertion.

Solution: Ensure the array is properly initialized to avoid null references.

Mistake: Forgetting that arrays are zero-indexed in most programming languages.

Solution: Always start your index at 0 when accessing array elements.