C删除矩阵中的许多元素？

Question

Let's assume I have a matrix[4][10] that looks like this:

**********
**********
**********
**********

I want to enter a coordinate and remove everything to the right and below the coordinates.

For example, if coordinates are 3, 5 it will look like this:

**********
**********
****
****

If coordinates are 1, 1 it will look like this:

(blank)

I have tried to do this with loops, but I only succeed removing everything to the right of the coordinates, not everything below it too:

for(x; x <= 4; x++)
{
    for(y; y <= 10; y++)
    {
        matrix[x-1][y-1] = ' ';
    }
}

Answer 1

The problem is that after you complete your first iteration of the outer for loop, the value of y is not updated, so it will still be 11 .

void removeBottomRight( char matrix[4][], int x, int y )
{
    for( int xi = x; xi <= 4; ++xi )
    {
        for( int yi = y; yi <= 10; ++yi )
            matrix[xi-1][yi-1] = ' ';
    }
}