方法返回零

Question

這是假設返回19個全座位和68名學生剩餘價值！ 請幫助，我的理解是我返回正確的值並將它們分配給正確的變量！

public class JetCalculator 
{ 
    public static void main(String[] args) 
    { 
     int totalStudents = 3013; 
     int jetCapacity = 155; 
     int jets; 
     int students; 
     jets = calculateJets(jetCapacity, totalStudents); 
     students = calculateStudents(jetCapacity, totalStudents, jets); 

     System.out.println("A total of "+ totalStudents + " student require "+ jets + " full seated jets."); 
     System.out.println("There will be " + students + " students remaining"); 
     System.out.println("_____________________________________________"); 
     System.out.println(jets); 
     System.out.println(jetCapacity); 
     System.out.println(students); 
    } 

    public static int calculateJets(int totalStudents, int jetCapacity) 
    { 
     int fullJets; 
     fullJets = totalStudents/jetCapacity; 
     return fullJets; 
    } 

    public static int calculateStudents(int jetCapacity, int totalStudents, int jets) 
    { 
     int remainingStudents; 
     remainingStudents = jetCapacity * jets; 
     return remainingStudents; 
    } 
} 

Answer 1

您正在將參數傳回給前端。

您通過傳遞容量然後給學生打電話calculateJets：calculateJets(jetCapacity, totalStudents);但方法要求學生容量：calculateJets(int totalStudents, int jetCapacity)。

這是在整個類接口中參數順序一致性的一個好參數。

爲了幫助調試這在未來嘗試的方法開始在println扔，看看發生了什麼：

System.out.println("Called calculateJets with totalStudents of " + totalStudents + " and jetCapacity of " + jetCapacity); 

Answer 2

純粹基於方法的名字：你的意思是說remainingStudents = totalStudents - (jetCapacity * jets);？

Answer 3

你叫calculateJets這樣

jets = calculateJets(jetCapacity, totalStudents); 

但此方法的參數名意味着您切換呼叫

public static int calculateJets(int totalStudents, int jetCapacity) 

這意味着你實際上在做155/3013他們爲了這是0使用整數算術。