为什么我得到错误的输出 - 如果＆其他语句

Question

下面列出了我应该做的事情的描述。该程序运行，但我不能得到正确的数字输出。我认为逻辑是对的，但它不起作用。

我们得到＃个Cookie，这些盒子将= Cookie的数量除以24，如果有额外的Cookie> 0，我们增加一个盒子。

我们带箱子的数量，额外的箱子数量> 0，我们增加一个集装箱。

然后我们有运输容器和箱子的总数。

我不知道为什么它不能正常工作，并且在过去的3个小时里一直困在这个问题上，最后放弃了并寻求帮助。

一盒饼干可以容纳24个饼干，一个容器可容纳75盒饼干 。编写一个程序，提示用户输入总数为 的Cookie，盒子中的Cookie数量以及 容器中的Cookie数量。程序然后输出盒子的数量和容器的数量以运送饼干。请注意，每个方框必须包含指定的 个cookie，并且每个容器必须包含指定数量的 方框。如果最后一盒Cookie的数量少于指定的 Cookie数量，您可以丢弃它并输出剩余的Cookie数量。同样， 如果最后一个容器包含少于指定框的数量，则您可以丢弃它并输出剩余框的数量。因为这是章节 在选择性控制结构上，如果没有cookie或没有框 剩余，则剩余的cookie或剩余的框不得输出。

#include<iostream> 
#include<cmath> 

using namespace std; 

int main() 

{ 
// Declare variables 
    int cookies, extraCookies; 
    int boxes,totalBoxes; 
    int leftOverBoxes; 
    int containers; 
    boxes = (cookies/24); 

    extraCookies = cookies%24; 
    containers = boxes/75; 
    leftOverBoxes = boxes%75; 


// Ask for the user input (doesnt make sense because we are given the capacities) 
    cout << " How many cookies do you have ?"<< endl; 
    cin >> cookies; 
    cout << " You have this many cookies: " << cookies << endl; 

    cout << " How many cookies can you fit in one box ?" << endl; 
    cin >> cookies; 

    cout << " How many cookie boxes can you fit into a container ?" << endl; 
    cin >> boxes; 

    // Computer number of boxes needed 
    if(extraCookies > 0) 
     totalBoxes = (boxes + 1); 
    cout <<" We need this many boxes:" << totalBoxes << endl; 

    if(leftOverBoxes > 0) 
     containers = (containers + 1); 
    cout << "We need this many containers: " << containers << endl; 


    return 0; 



    } 

Answer 1

C++自顶向下读取。请允许我评论添加到您的代码，并解释这是怎么回事：

#include<iostream> 
#include<cmath> 

using namespace std; // Bad practice, by the way 

int main() 

{ 
// Declare variables 
    int cookies, extraCookies; // cookies = 0, extraCookies = 0 
    int boxes,totalBoxes; // boxes = 0, totalBoxes = 0 
    int leftOverBoxes; // leftOverBoxes = 0 
    int containers; // containers = 0 
    boxes = (cookies/24); // boxes = 0/24 = 0, this line does nothing 

    extraCookies = cookies%24; // extraCookies = 0%24 = 0, this line does nothing 
    containers = boxes/75; // containers = 0/75 = 0, this line does nothing 
    leftOverBoxes = boxes%75; // leftOverBoxes = 0%75 = 0, this line does nothing 


// Ask for the user input (doesnt make sense because we are given the capacities) 
    cout << " How many cookies do you have ?"<< endl; 
    cin >> cookies; 
    cout << " You have this many cookies: " << cookies << endl; 

    cout << " How many cookies can you fit in one box ?" << endl; 
    cin >> cookies; // You throw away how many cookies the user has, and rewrite it with how many cookies fit in one box 

    cout << " How many cookie boxes can you fit into a container ?" << endl; 
    cin >> boxes; 

    // Computer number of boxes needed 
    if(extraCookies > 0) // 0 > 0 == false 
     totalBoxes = (boxes + 1); 
    cout <<" We need this many boxes:" << totalBoxes << endl; 

    if(leftOverBoxes > 0) // 0 > 0 == false 
     containers = (containers + 1); 
    cout << "We need this many containers: " << containers << endl; 


    return 0; 



    } 

你从用户采取输入之前计算boxes，extraCookies，containers和leftOverBoxes。它们全部初始化为0.

您应该在接受用户输入后计算它们。

将代码视为一系列指令。如果你还没有一定数量的cookies，你无法弄清楚你需要多少盒子。