Java 代码

import java.util.Scanner;

public class Main
{
    public static void main(String[] args)
    {
        Scanner cin = new Scanner(System.in);

        double s = cin.nextDouble();

        double[] sr = {0, 400.01, 800.01, 1200.01, 2000.01};
        int[] p = {15, 12, 10, 7, 4};

        double inc = 0.0;
        int incP = 0;

        for (int i = sr.length-1; i >=0; i--)
        {
            if (s >= sr[i])
            {
                incP = p[i];
                inc = s * incP / 100.0;
                s += inc;
                break;
            }
        }
        System.out.println("Novo salario: " + String.format("%.2f", s));
        System.out.println("Reajuste ganho: " + String.format("%.2f", inc));
        System.out.println("Em percentual: " + incP + " %");
    }
}