Drawing Isosceles Triangles

Another fun shape is the isosceles triangle.

  *
 ***
*****

For this one, the each row of the triangle needs to have spaces before it to shift it in to the center. How much each row needs to be shifted depends on how big the trangle will be overall.

In this case with three rows of *s, the top * needs two space characters before it and the second row needs one space character.

void main() {
System.out.println("   *\n  ***\n*****");
}

So any loop we make needs to take this pattern into account.

void main() {
int totalRows = 5;
for (int row = 1; row <= totalRows; row++) {
    for (int i = 0; i < totalRows - row; i++) {
        System.out.print(" ");
    }
    for (int i = 0; i < row * 2 - 1; i++) {
        System.out.print("*");
    }
    System.out.println();
}
}

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

Which can get tricky. For now, you can just study the code that does it for this shape. There will be more things to draw in the challenges section.¹