rectangleType.h
class rectangleType
{
public:
void setDimension(double l, double w);
//Function to set the length and width of the rectangle.
//Postcondition: length = l; width = w;
double getLength() const;
//Function to return the length of the rectangle.
//Postcondition: The value of length is returned.
double getWidth() const;
//Function to return the width of the rectangle.
//Postcondition: The value of width is returned.
double area() const;
//Function to return the area of the rectangle.
//Postcondition: The area of the rectangle is
// calculated and returned.
double perimeter() const;
//Function to return the perimeter of the rectangle.
//Postcondition: The perimeter of the rectangle is
// calculated and returned.
void print() const;
//Function to output the length and width of
//the rectangle.
rectangleType();
//Default constructor
//Postcondition: length = 0; width = 0;
rectangleType(double l, double w);
//Constructor with parameters
//Postcondition: length = l; width = w;
private:
double length;
double width;
};
rectangleType.cpp
#include<iostream>
#include"rectangleType.h"
using namespace std;
void rectangleType:: setDimension(double l, double w){
length = l;
width = w;
}
double rectangleType:: getLength() const{
return length;
}
double rectangleType:: getWidth() const{
return width;
}
double rectangleType:: area() const{
return (length*width);
}
double rectangleType:: perimeter() const{
return ((length*2)+(width*2));
}
void rectangleType:: print() const{
cout << "the width is: " << width << endl;
cout << "the length is: " << length << endl;
}
rectangleType:: rectangleType(){
length = 0;
width = 0;
}
rectangleType:: rectangleType(double l, double w){
length = l;
width = w;
}
boxType.h
class boxType : public rectangleType
{
public:
void setDimension(double l, double w, double h);
//Function to set the length, width, and height
//of the box.
//Postcondition: length = l; width = w; height = h;
double getHeight() const;
//Function to return the height of the box.
//Postcondition: The value of height is returned.
double area() const;
//Function to return the surface area of the box.
//Postcondition: The surface area of the box is
// calculated and returned.
double volume() const;
//Function to return the volume of the box.
//Postcondition: The volume of the box is
// calculated and returned.
void print() const;
//Function to output the length, width, and height of a box.
boxType();
//Default constructor
//Postcondition: length = 0; width = 0; height = 0;
boxType(double l, double w, double h);
//Constructor with parameters
//Postcondition: length = l; width = w; height = h;
private:
double height;
};
boxType.cpp
#include<iostream>
#include"boxType.h"
#include"rectangleType.h"
using namespace std;
void boxType:: setDimension(double l, double w, double h){
length = l;
width = w;
height = h;
}
double boxType:: getHeight() const{
return height;
}
double boxType:: area() const{
return (length*width*height);
}
double boxType:: volume() const{
return ((2*length*width)+(2*length*height)+(2*width*height))
}
void boxType:: print() const{
cout << "the width is: " << width << endl;
cout << "the length is: " << length << endl;
cout << "the height is: " << height << endl;
}
boxType:: boxType() : rectangleType.cpp(){
height = 0;
}
boxType:: boxType(double l, double w, double h) : rectangleType.cpp(double l, double w){
height = h;
}
RectangleTypeTest.cpp
#include<iostream>
#include"rectangleType.h"
#include"boxType.h"
using namespace std;
int main(){
rectangleType firstRectangle;
rectangleType secondRectangle(2, 2);
firstRectangle.setDimension(3, 3);
cout << "rectangle's length is: " << firstRectangle.getLength() << endl;
cout << "rectangle's width is: " << firstRectangle.getWidth() << endl;
cout << "rectangle's area is: " << firstRectangle.area() << endl;
cout << "rectangle's perimeter is: " << firstRectangle.perimeter() << endl;
secondRectangle.print();
boxType firstBox;
boxType secondBox(2, 2, 2);
firstBox.setDimension(3, 3, 3);
cout << "box's length is: " << firstBox.getLength() << endl;
cout << "box's width is: " << firstBox.getWidth() << endl;
cout << "box's height is: " << firstBox.getHeight() << endl;
cout << "box's area is: " << firstBox.area() << endl;
cout << "box's volume is: " << firstBox.volume() << endl;
secondBox.print();
}
我正在编译：
g++ -o rectangleTest rectangleTypeTest.cpp rectangleType.cpp boxType.cpp
我收到错误消息：
In file included from boxType.cpp:2:0:
boxType.h:2:1: error: expected class-name before ‘{’ token
{
^
boxType.cpp: In member function ‘void boxType::setDimension(double, double, double)’:
boxType.cpp:8:2: error: ‘length’ was not declared in this scope
length = l;
^
boxType.cpp:9:2: error: ‘width’ was not declared in this scope
width = w;
^
boxType.cpp: In member function ‘double boxType::area() const’:
boxType.cpp:18:10: error: ‘length’ was not declared in this scope
return (length*width*height);
^
boxType.cpp:18:17: error: ‘width’ was not declared in this scope
return (length*width*height);
^
boxType.cpp: In member function ‘double boxType::volume() const’:
boxType.cpp:22:13: error: ‘length’ was not declared in this scope
return ((2*length*width)+(2*length*height)+(2*width*height))
^
boxType.cpp:22:20: error: ‘width’ was not declared in this scope
return ((2*length*width)+(2*length*height)+(2*width*height))
^
boxType.cpp:23:1: error: expected ‘;’ before ‘}’ token
}
^
boxType.cpp: In member function ‘void boxType::print() const’:
boxType.cpp:26:30: error: ‘width’ was not declared in this scope
cout << "the width is: " << width << endl;
^
boxType.cpp:27:31: error: ‘length’ was not declared in this scope
cout << "the length is: " << length << endl;
^
boxType.cpp: In constructor ‘boxType::boxType()’:
boxType.cpp:31:23: error: type ‘rectangleType’ is not a direct base of ‘boxType’
boxType:: boxType() : rectangleType(){
^
boxType.cpp: In constructor ‘boxType::boxType(double, double, double)’:
boxType.cpp:35:51: error: type ‘rectangleType’ is not a direct base of ‘boxType’
boxType:: boxType(double l, double w, double h) : rectangleType(double l, double w){
^
boxType.cpp:35:65: error: expected primary-expression before ‘double’
boxType:: boxType(double l, double w, double h) : rectangleType(double l, double w){
^
boxType.cpp:35:75: error: expected primary-expression before ‘double’
boxType:: boxType(double l, double w, double h) : rectangleType(double l, double w){
^
此错误似乎主要未在此范围错误中声明。在我看来，它不是继承自rectangleType。不确定我做错了什么。任何帮助，将不胜感激。谢谢。
答案 0 :(得分：1)
多个错误