用JAVA编程:求Z=[(C-R)-(C+R)*0.006]*N*0.4;其中C,R,N为键盘输入,求Z值输出.求高手帮忙,万分感谢.

package a761208;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/**
*
* @author A761208
*
*/
public class Test {

/**
* @param args
*/
public static void main(String[] args) {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String cs,rs,ns;
float c,r,n;
double z;
try {
System.out.println("Please input C:");
cs = br.readLine();
System.out.println("Please input R:");
rs = br.readLine();
System.out.println("Please input N:");
ns = br.readLine();
c = Float.parseFloat(cs);
r = Float.parseFloat(rs);
n = Float.parseFloat(ns);
z = ((c - r) - (c + r) * 0.006) * n * 0.4;
System.out.println("Z=" + z);
} catch (IOException e) {
e.printStackTrace();
}<