你能帮我解决我的 for 循环吗？ 它没有转动正确的度数

Question

public void turnLeft(double degrees) {
    for (int i = 0; i < degrees; i++) {
        this.left(degrees);
    }
}

This code helps my turtle turn how many ever degrees I want it to, but when I put in like 180 degrees it only turns 90.

Answer 1

I can only guess that your implementation of the left method rotates turtle on degrees number, specified with method parameter.

In your case (calling of the turnLeft(180) ) the loop will do the following:

this.left(1); this.left(2); ... this.left(180);

so... it very similar with calling the turnLeft method with number of degrees equals 1+2+3+...+180 it is 16110

So in this case your turtle makes 16110 div 360 = 44 whole cycles and then rotate on 16110 mod 360 = 270 degrees. So it will be in 90 degrees from your initial state. But it is only my guess what could be happen.