geometry - Make a upside down triangle in java

Question

I am trying to make the triangle I have made up side down. Tried many times, but I don't know how to do this.

The code I have know is:

public static void drawPyramide(int lines, char symbol, boolean startDown) {
    //TRIANGLE

    if(startDown) {
                //The triangle up side down should be here. 
            }

    else {
        int c = 1;
        for (int i = 0; i < lines; i++) {
            for (int j = i; j < lines; j++) {
                System.out.print(" ");
            }
            for (int k = 1; k <= c; k++) {
                if (k%2==0) System.out.print(" ");

                else System.out.print(symbol);
            }

        System.out.print("
");
        c += 2;
        }
    }

}

Any suggestions how I can "flip" this triangle? Thanks.

Answer 1

To flip the triangle you really just need to change the direction of iteration. Instead of going from i = 0 to i < lines you need to go down from i = lines-1 to i >= 0

You also need to change the c to how many spaces and symbols you want to start with.

Could look like this:

int c = 2*lines;
for (int i = lines-1; i>=0; i--)
{
    for (int j = i; j < lines; j++)
    {
        System.out.print(" ");
    }
    for (int k = 1; k <= c; k++)
    {
        if (k % 2 == 0)
        {
            System.out.print(" ");
        }
        else
        {
            System.out.print(symbol);
        }
    }

    System.out.print("
");
    c -= 2;
}