public class TestNNN {
    public static void main(String[] args) {
        int a = 0;
        int b = 0;
        float min = 100;
        for (int i = 1; i <= 20; i++) {
            for (int j = 1; j <= 20; j++) {
                if (i % 2 == 0 && j % 2 == 0)
                    continue;
                //（float）（i/j）：先做除法，再将商转为float；（float）i / j：先做类型转换，再做除法
                float value = (float)i/j - 0.618f;
                value = value < 0 ? 0 - value : value;
                if (value < min) {
                    min = value;
                    a = i;
                    b = j;
                }
            }
        }
        System.out.println("最接近的组合是：" + a + "/" + b + " = " + (float)a/b);
    }
}