Drawing Right Triangles

One of the more fun things to do with for loops¹ is to use them to print out shapes.

Say you wanted to draw this right triangle.

*
**
***

There is one *, then two *s on the next line, and three *s on the last.

If you were to write the code out to print this explicitly it would look like this.

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

Where \n is explicitly putting in the new lines.

Since counting up 1 -> 2 -> 3 is easy with for loops, you can translate this

void main() {
for (int numberOfStars = 1; numberOfStars <= 3; numberOfStars++) {
    for (int i = 0; i < numberOfStars; i++) {
        System.out.print("*");
    }
    // Same as System.out.print("\n");
    System.out.println();
}
}

Which makes it easy to make one of these triangles however tall you want.

void main() {
int height = 6;
for (int numberOfStars = 1; numberOfStars <= height; numberOfStars++) {
    for (int i = 0; i < numberOfStars; i++) {
        System.out.print("*");
    }
    System.out.println();
}
}

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