我究竟做错了什么？它没有做它的设计目的 [英] What am I doing wrong? It doesnt do what it's designed to do

问题描述

创建一个用于保存矩形的结构。结构应该有一个整数的长度和另一个整数的宽度为矩形。声明2个矩形变量并从用户读取它们。编写一个名为difference_area的函数，它接受两个矩形，计算它们区域的差异，然后输出结果。

Create a struct to hold a rectangle. The struct should have an integer for length and another integer for width for a rectangle. Declare 2 rectangle variables and read them in from the user. Write a function called difference_area that takes both rectangles, calculate the difference of their areas,and prints the result out.

#include<iostream>
using namespace std;

struct Rectanglebeta
{
  int width;
  int length;
  int area;
};
int difference_area(Rectanglebeta r1, Rectanglebeta r2)
{
  int sub;

  r1.area = r1.width * r1.length;
  r2.area = r2.width * r2.length;
  sub = rectangle1.area - r2.area;
  return sub;
}
int main()
{

struct Rectanglebeta rectangle1;
struct Rectanglebeta rectangle2;
  cout<<" The width of the 1st Rectangle is: "<<endl;
  cin>>r1.width;
  cout<<" The length of the 1st Rectangle is: "<<endl;
  cin>>r1.length;
  cout<<" The width of the 2nd Rectangle is: "<<endl;
  cin>>r2.width;
  cout<<" The length of the 2nd Rectangle  is: "<<endl;
  cin>>r2.length;
  difference_area(rectangle1, rectangle2);
  return 0;
}

我的尝试：



创建一个用于保存矩形的结构。结构应该有一个整数的长度和另一个整数的宽度为矩形。声明2个矩形变量并从用户读取它们。编写一个名为difference_area的函数，它接受两个矩形，计算它们区域的差异，然后输出结果。

What I have tried:

Create a struct to hold a rectangle. The struct should have an integer for length and another integer for width for a rectangle. Declare 2 rectangle variables and read them in from the user. Write a function called difference_area that takes both rectangles, calculate the difference of their areas,and prints the result out.

#include<iostream>
using namespace std;

struct Rectanglebeta
{
  int width;
  int length;
  int area;
};
int difference_area(Rectanglebeta r1, Rectanglebeta r2)
{
  int sub;

  r1.area = r1.width * r1.length;
  r2.area = r2.width * r2.length;
  sub = rectangle1.area - r2.area;
  return sub;
}
int main()
{

struct Rectanglebeta rectangle1;
struct Rectanglebeta rectangle2;
  cout<<" The width of the 1st Rectangle is: "<<endl;
  cin>>r1.width;
  cout<<" The length of the 1st Rectangle is: "<<endl;
  cin>>r1.length;
  cout<<" The width of the 2nd Rectangle is: "<<endl;
  cin>>r2.width;
  cout<<" The length of the 2nd Rectangle  is: "<<endl;
  cin>>r2.length;
  difference_area(rectangle1, rectangle2);
  return 0;
}

推荐答案

struct Rectanglebeta rectangle1;
struct Rectanglebeta rectangle2;
  cout<<" The width of the 1st Rectangle is: "<<endl;
  cin>>r1.width;
  cout<<" The length of the 1st Rectangle is: "<<endl;
  cin>>r1.length;

您声明两个矩形 rectangle1 和 rectangle2 ，但是你使用名称 r1 和 r2 来尝试和引用他们。此外，您忘记从 difference_area 的调用中捕获返回的值并将其打印出来。

You declare two rectangles rectangle1 and rectangle2, but then you use the names r1 and r2 to try and reference them. Also you forgot to capture the returned value from the call to difference_area and print it out.

Quote：

并输出结果。

您的代码不会尝试打印任何结果。



当你不理解你的代码在做什么或为什么它做它的作用时，答案是调试器。

使用调试器看看你的代码在做什么。只需设置断点并查看代码执行情况，调试器允许您逐行执行第1行并在执行时检查变量，这是一个令人难以置信的学习工具。



调试器 - 维基百科，免费的百科全书 [ ^ ]

掌握Visual Studio 2010中的调试 - 初学者指南 [ ^ ]



调试器在这里显示你的代码正在做什么，你的任务是与它应该做什么进行比较。

调试器中没有魔法，它没有发现错误，它只是帮助你。当代码没有达到预期的效果时，你就会接近一个错误。

Your code does not try to print any result.

When you don't understand what your code is doing or why it does what it does, the answer is debugger.
Use the debugger to see what your code is doing. Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute, it is an incredible learning tool.

Debugger - Wikipedia, the free encyclopedia[^]
Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]

The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't find bugs, it just help you to. When the code don't do what is expected, you are close to a bug.

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