C++ 需要帮助解决我程序中的小问题吗
这是我的代码:C++ 需要帮助解决我程序中的小问题吗,c++,rectangles,C++,Rectangles,这是我的代码: #include <iostream> #include <string> #include <vector> using namespace std; class Point { private: double px; double py; public: void setX(const double x); void setY(const double y); double getX() con
#include <iostream>
#include <string>
#include <vector>
using namespace std;
class Point
{
private:
double px;
double py;
public:
void setX(const double x);
void setY(const double y);
double getX() const;
double getY() const;
};
class Rectangle
{
private:
string name;
Point blPoint;
double length, height;
public:
// member functions
void setName(const string & inName);
void setBottomLeft(const double x, const double y);
void setDimensions(const double inLength, const double inHeight);
string getName() const;
Point getBottomLeft() const;
double getLength() const;
double getHeight() const;
double area() const;
double perimeter() const;
Point midPoint() const;
void scaleBy2();
void display() const;
};
// FUNCTION PROTOTYPES GO HERE:
void welcome();
bool read_rec(const string promptName, const string errorInvalid, const string errorUsed, string & inName, vector<Rectangle> & list);
void read_coord(const string promptPoint, double & x, double & y);
void read_length(const string promptLength, double & inLength, double & inHeight);
void add_rec(const string Name, double x, double y, double inLength, double inHeight, vector<Rectangle> & list);
int main()
{
// Define your local variables, e.g. a vector of class Rectangle
Rectangle rec;
vector<Rectangle> list;
string prompt1stName = "Enter the name of the first rectangle: ";
string promptName = "Enter the name of the next rectangle: ";
string errorInvalid = "Invalid input. Type 'rec' following by the name or 'stop' if done.";
string errorUsed = "This name is already being used!";
string inName;
string Name;
// Display welcome banner
welcome();
/* Prompt user for first rectangle or 'stop' */
bool read = read_rec(prompt1stName, errorInvalid, errorUsed, inName, list);
// WHILE user input is invalid
while (read == false)
{
// Display "Try again! "
cout << "Try again! " << endl;
read = read_rec(prompt1stName, errorInvalid, errorUsed, inName, list);
}
// IF user input is not 'stop'
if (inName != "stop")
{
// Extract rectangle name from user input
int a = inName.length() - 4;
Name = inName.substr(4, a);
// Prompt for bottom left point
double x, y;
string promptPoint = "Enter " + Name + "'s bottom left x and y coords: ";
read_coord(promptPoint, x, y);
// Prompt for length and height
double inLength, inHeight;
string promptLength = "Enter " + Name + "'s length and height: ";
read_length(promptLength, inLength, inHeight);
// Add rectangle to the rectangle list
add_rec(Name, x, y, inLength, inHeight, list);
}
/* Prompt user for next rectangle or 'stop' */
// WHILE user input not 'stop'
while (inName != "stop")
{
// Display "Thank you! "
cout << "Thank you! ";
bool read = read_rec(promptName, errorInvalid, errorUsed, inName, list);
// WHILE user input is invalid while (read == false)
{
// Display "Try again! "
cout << "Try again! " << endl;
read = read_rec(promptName, errorInvalid, errorUsed, inName, list);
}
// IF user input is not 'stop'
if (inName != "stop")
{
// Extract rectangle name from user input
int a = inName.length() - 4;
Name = inName.substr(4, a);
// Prompt for bottom left point
double x, y;
string promptPoint = "Enter " + Name + "'s bottom left x and y coords: ";
read_coord(promptPoint, x, y);
// Prompt for length and height
double inLength, inHeight;
string promptLength = "Enter " + Name + "'s length and height: ";
read_length(promptLength, inLength, inHeight);
// Add rectangle to the rectangle list
add_rec(Name, x, y, inLength, inHeight, list);
}
}
// IF the rectangle list is not empty
if (list.size() != 0)
{
// Display all rectangles in the rectangle list
int rec_num = 0;
int i = 1;
while (i< list.size())
{
rec_num++;
i++;
}
cout << "You have " << rec_num+1 << " rectangle(s) in your list: ";
cout << endl;
for (int i = 0; i < list.size(); i++)
{
cout << "Rectangle '" << list[i].getName() << "' : ";
list[i].display();
list[i].scaleBy2();
cout << " After scale by 2: ";
list[i].display();
cout << endl;
}
}
// ELSE
else
{
// Display that no rectangles are in the list
cout << "You have no rectangles in your list." << endl;
}
return 0;
}
// FUNCTION DEFINITIONS GO HERE:
void welcome()
{
cout << "Welcome! Create your own list of rectangles." << endl;
cout << "You will be asked to provide information about each rectangle in your list by name." << endl;
cout << "Type the word 'stop' for the rectangle name when you are done." << endl;
cout << endl;
}
bool read_rec(const string promptName, const string errorInvalid, const string errorUsed, string & inName, vector<Rectangle> & list)
{
cout << promptName;
getline(cin, inName);
if (inName == "stop")
{
return(true);
}
else if (inName.substr(0,4) != "rec ")
{
cout << errorInvalid;
return(false);
}
else
{
int j = 0;
for (int i = 0; i < list.size(); i++)
{
if (inName == "rec " + list[i].getName())
{
j = j+1;
}
}
if (j == 0)
{
return(true);
}
if (j != 0)
{
cout << errorUsed;
return(false);
}
}
}
void read_coord(const string promptPoint, double & x, double & y)
{
cout << promptPoint;
cin >> x;
cin >> y;
}
void read_length(const string promptLength, double & inLength, double & inHeight)
{
cout << promptLength;
cin >> inLength;
cin >> inHeight;
cout << endl;
while (inLength <= 0 || inHeight <= 0)
{
cout << "Make length and height positive values. Try again.";
cout << promptLength;
cin >> inLength;
cin >> inHeight;
cout << endl;
}
}
void add_rec(const string Name, double x, double y, double inLength, double inHeight, vector<Rectangle> & list)
{
Rectangle rec;
rec.setName(Name);
rec.setBottomLeft(x, y);
rec.setDimensions(inLength, inHeight);
list.push_back(rec);
}
// CLASS MEMBER FUNCTION DEFINITINOS GO HERE:
void Point::setX(const double x)
{
px = x;
}
void Point::setY(const double y)
{
py = y;
}
double Point::getX() const
{
return (px);
}
double Point::getY() const
{
return (py);
}
void Rectangle::setName(const string & inName)
{
name = inName;
}
void Rectangle::setBottomLeft(const double x, const double y)
{
blPoint.setX(x);
blPoint.setY(y);
}
void Rectangle::setDimensions(const double inLength, const double inHeight)
{
length = inLength;
height = inHeight;
}
string Rectangle::getName() const
{
return (name);
}
Point Rectangle::getBottomLeft() const
{
return (blPoint);
}
double Rectangle::getLength() const
{
return (length);
}
double Rectangle::getHeight() const
{
return (height);
}
double Rectangle::area() const
{
// area = length * height
return(length * height);
}
double Rectangle::perimeter() const
{
// perimeter = 2 * (length + height);
return(2 * (length + height));
}
Point Rectangle::midPoint() const
{
Point midPoint;
double mx = blPoint.getX() + 0.5 * length;
double my = blPoint.getY() + 0.5 * height;
midPoint.setX(mx);
midPoint.setY(my);
return(midPoint);
}
void Rectangle::scaleBy2()
{
double midx = blPoint.getX() + 0.5 * length;
double midy = blPoint.getY() + 0.5 * height;
double newblPx = midx - length;
double newblPy = midy - height;
length = 2*length;
height = 2*height;
blPoint.setX(newblPx);
blPoint.setY(newblPy);
}
void Rectangle::display() const
{
cout << " Location is (" << blPoint.getX() << ", " << blPoint.getY() << "), length is " << length << ", height is " << height << "; Area is " << area() << "; perimeter is " << perimeter() << ", midpoint is located at (" << midPoint().getX() << ", " << midPoint().getY() << ")" << endl;
}
#包括
#包括
#包括
使用名称空间std;
类点
{
私人:
双px;
双py;
公众:
无效集x(常数双x);
void setY(const double y);
双getX()常量;
双getY()常数;
};
类矩形
{
私人:
字符串名;
点BL点;
双倍长度、高度;
公众:
//成员函数
void setName(常量字符串和inName);
void setBottomLeft(常数倍x,常数倍y);
空隙设置尺寸(长度为常数倍,高度为常数倍);
字符串getName()常量;
点getBottomLeft()常量;
双getLength()常量;
双getHeight()常量;
双面积常数;
双周长常数;
点中点()常数;
空标度b2();
void display()常量;
};
//功能原型如下:
无效欢迎();
bool read_rec(常量字符串promptName、常量字符串errorInvalid、常量字符串errorUsed、字符串和inName、向量和列表);
无效读取坐标(常量字符串提示点、双精度x、双精度y);
无效读取长度(常量字符串长度、双倍和内长、双倍和内高);
void add_rec(常量字符串名称、双x、双y、双长度、双高度、向量和列表);
int main()
{
//定义局部变量,例如类矩形的向量
矩形rec;
向量表;
string prompt1stName=“输入第一个矩形的名称:”;
string promptName=“输入下一个矩形的名称:”;
string errorInvalid=“输入无效。在名称后面键入'rec',如果完成,则键入'stop'。”;
string errorUsed=“此名称已被使用!”;
名称中的字符串;
字符串名;
//展示欢迎横幅
欢迎();
/*提示用户输入第一个矩形或“停止”*/
bool read=read_rec(prompt1stName,errorInvalid,errorUsed,inName,list);
//而用户输入无效
while(read==false)
{
//显示“重试!”
这是错误的
/* Prompt user for first rectangle or 'stop' */
bool read = read_rec(prompt1stName, errorInvalid, errorUsed, inName, list);
// WHILE user input is invalid
while (read == false)
{
// Display "Try again! "
cout << "Try again! " << endl;
bool read = read_rec(prompt1stName, errorInvalid, errorUsed, inName, list);
}
/*提示用户输入第一个矩形或“停止”*/
bool read=read_rec(prompt1stName,errorInvalid,errorUsed,inName,list);
//而用户输入无效
while(read==false)
{
//显示“重试!”
如果这是大量的代码,并且不符合本网站的问答风格,请尝试@mark:小心你的措辞-听起来像是在说“try Meta SO”()@阿拉赞:马克建议你标记你的帖子,并请版主将其移至代码审阅。哦……谢谢你纠正我!谢谢!修复了那个错误,你知道如何在输出错误无效时修复它吗?我相信它这样做是因为它不=rec,但用户没有输入我现在不知道。不确定,抱歉。我会使用调试器一步一步跟踪你的程序发生了什么。谢谢你的帮助!我现在就下载一个!
/* Prompt user for first rectangle or 'stop' */
bool read = read_rec(prompt1stName, errorInvalid, errorUsed, inName, list);
// WHILE user input is invalid
while (read == false)
{
// Display "Try again! "
cout << "Try again! " << endl;
read = read_rec(prompt1stName, errorInvalid, errorUsed, inName, list);
}
for (;;)
{
bool read = read_rec(prompt1stName, errorInvalid, errorUsed, inName, list);
if (read)
break;
cout << "Try again! " << endl;
}