java - 如果为负数则添加

我试图添加一个if else语句，以便当利润为负数时告诉他们它为负利润，而当利润为正数时告诉他们它为正。我在哪里放置if else语句，以及如何格式化以便工作。

import java.util.Scanner;
class Assignment2
{
    public static void main(String[] args) //header of the main method
    {
     Scanner in = new Scanner(System.in);


        String First;
        String Last;
        String StockCode;
        double ShareNumber;
        double StockBuy;
        double StockSell;
        final double charge =.02;

        System.out.println("Enter your First name");
        First = in.nextLine();

        System.out.println("Enter your Last name");
        Last = in.nextLine();

        System.out.println("Enter the stock code");
        StockCode = in.nextLine();

        System.out.println("How much did the stocks cost?");
        StockBuy = in.nextInt();

        System.out.println("How many shares did you buy?");
        ShareNumber = in.nextInt();

        System.out.println("Customer Name:" + First.toUpperCase() + ' ' + Last.toUpperCase());

        System.out.println("Stock Code:" + StockCode );
        System.out.println("Stock Cost:" + ((StockBuy * charge) + (ShareNumber*StockBuy)));

  }
}

最佳答案

从用户获得所有变量值之后，定义一个类型为double的变量，称为Profit =基于您获得的变量的一些数学计算，然后

if(profit>0) {System.out.println("positive profit");}
else if(profit<0) {System.out.println("negative profit");}
else if(profit==0) {System.out.println("zero profit");}