小题一道

public class Insert {

    public static double f(double m, double n) {

        int ex = 1;
        while (m * ex + 1 > n * ex) {
            ex *= 10;
        }
        return Math.floor(m) / ex;

    }

    public static void main(String[] args) {
        double a = 1.111;
        double b = 2;
        double c = f(a, b);
        System.out.println("c===" + c);
    }
}

试试