How can you resize a two-dimensional array?

You can resize a two-dimensional array by creating a new array with the desired size and copying the elements over.

In most programming languages, arrays are fixed in size. This means that once you create an array, you cannot change its size. However, you can effectively resize an array by creating a new array with the desired size and then copying the elements from the old array to the new one. This process is often referred to as 'resizing' an array.

For a two-dimensional array, the process is slightly more complex because you have to deal with an array of arrays. But the principle remains the same. You create a new two-dimensional array with the desired size, and then you iterate over the old array and copy its elements to the new one.

In Java, for example, you might do something like this:

```
int[][] oldArray = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
int[][] newArray = new int[4][3];

for (int i = 0; i < oldArray.length; i++) {
for (int j = 0; j < oldArray[i].length; j++) {
newArray[i][j] = oldArray[i][j];
}
}
```

In this example, `oldArray` is a 3x3 array, and `newArray` is a 4x3 array. The nested for loops copy the elements from `oldArray` to `newArray`. After the loops, `newArray` contains all the elements of `oldArray`, but it has an additional row that can be filled with new elements.

It's important to note that this process involves creating a new array and copying elements, which can be computationally expensive if the array is large. If you need to frequently resize arrays in your program, you might want to consider using a different data structure, such as a list or a vector, which can dynamically resize itself as needed.