<分区>
这是我的错误结果中使用的所有 .cpp 和 .h 文件。它们是我之前看到并修复的错误，但我不明白为什么会出现这些错误，它不会为代码提供正确的语法。
形状.h
#ifndef SHAPE_H
#define SHAPE_H
#include <iostream>
#include <math.h>
#include <cmath>
#include <cstring>
#include <string>
#include <algorithm>
#include <iomanip>
#include <stdlib.h>
using std::cout; using std::cerr; using std::endl;
using std::string;
class Shape{
public:
Shape(const string&) { } //default constructor
virtual void print() const;
virtual double get_area() const;
virtual ~Shape();
private:
string color;
};
#endif
形状.cpp
#include "shape.h"
using std::cout; using std::cerr; using std::endl;
using std::string;
void Shape::print() const{
cout << color << endl; }
Shape::Shape(const string& color1):color(color1)
{/*color = color1;*/ }
Shape::~Shape()
{ }
圆.h
#ifndef CIRCLE_H
#define CIRCLE_H
#include <iostream>
#include <math.h>
#include <cmath>
#include <cstring>
#include <string>
#include <algorithm>
#include <iomanip>
#include <stdlib.h>
#include <vector>
#include "shape.h"
using namespace std;
using std::cout; using std::cerr; using std::endl;
using std::string; using std::vector;
class Circle : public Shape{
public:
Circle(const string& , int);
virtual void print() const;
virtual double get_area() const;
private:
int radius;
};
#endif
圆.cpp
#include "circle.h"
using std::cout; using std::cerr; using std::endl;
using std::string;
Circle::Circle(const string& color1,int newRadius):Shape(color1),radius(newRadius) {}
double Circle::get_area() const{
double area;
area = M_PI * (pow(radius,2) );
return area;
}
void Circle::print() const{
cout << "Circle: " <<
<< color << " circle, "
<< "radius " << radius << ", "
<< "area " << get_area() << endl;
}
主要
#include <iostream>
#include "shape.h"
#include "circle.h"
#include <vector>
using std::vector; using std::string;
using namespace std;
int main{
vector<Shape *> shape1(1);
shape1[0] = new Circle("Green",20);
/*
for(int i = 0; i < arr; i++ )
i.print();
for(int i = 0; i < arr; i++ )
delete [] arr;
*/
return 0;
错误:
assign9.cpp:9:17: error: expected primary-expression before ‘shape1’
vector<Shape *> shape1(1);
^
assign9.cpp:9:17: error: expected ‘}’ before ‘shape1’
assign9.cpp:9:17: error: expected ‘,’ or ‘;’ before ‘shape1’
assign9.cpp:10:1: error: ‘shape1’ does not name a type
shape1[0] = new Circle("Green",20);
^
assign9.cpp:19:2: error: expected unqualified-id before ‘return’
return 0;
^
assign9.cpp:20:1: error: expected declaration before ‘}’ token
}
^
我不明白这些错误是怎么来的，连我的助教也弄不明白。我感谢任何反馈。谢谢