java之浮点数（笔记）

public static void main(String[] args) {
        double b1 = 0.1;
        double b2 = 0.2;
        double result = b1 + b2;
        System.out.print(result);
    }

public static void main(String[] args) {
        float f1 = 30000000;
        float f2 = 1;
        float r = f1 + f2;
        if(r < f1)
            System.out.println("left smaller");
        else
            System.out.println("what?");
    }

public static void main(String[] args) {
        System.out.println((int)Double.NaN);
        System.out.println((int)Double.POSITIVE_INFINITY);
        System.out.println((int)Double.NEGATIVE_INFINITY);
    }