c++ - 无法识别 C++ 中的字符串数据类型

Question

我正在使用 Visual C++ 2008 速成版学习 C++ 编程。我的程序没有识别 std::string数据类型。我已经包含了 <string>图书馆。

#include "stdafx.h"
#include <iostream>
#include "TestClass.h"
#include <string>

using namespace std;

class Rectangle {
private:
    int width;
    int height;
    double area;
    string name;

public:
    Rectangle()
    {
        width = 0;
        height = 0;
    }

    int getWidth()
    {
        return width;
    }

    int getHeight()
    {
        return height;
    }

    void setWidth(int width)
    {
        this->width = width;
    }

    void setHeight(int height)
    {
        this->height= height;
    }

    void setArea( )
    {
        area = width * height;
    }

    double getArea( )
    {
        return area;
    }

    Rectangle (const Rectangle & x)
    {
        this->area = x.area;
    }

    void friendtestfunction(Rectangle2 s)
    {
        cout << "" << s.name;
    }
};

int Rectangle2::stat_var = 5;

int _tmain(int argc, _TCHAR* argv[])
{
    Rectangle rect;
    rect.setWidth(10);
    rect.setHeight(20);
    rect.setArea( );

    cout<< "height is equal to :" << rect.getHeight() << endl;
    cout<< "width is equal to :" << rect.getWidth() << endl;
    cout << "area is equal to :" << rect.getArea() << endl;

    getchar();
    return 0;
}

当我在 Rectangle 类中声明一个字符串类型的私有(private)变量时，它显示了以下错误:

1>c:\users\subith.p\documents\visual studio 2008\projects\test\test\testclass.h(10) : error C2146: syntax error : missing ';' before identifier 'name'

1>c:\users\subith.p\documents\visual studio 2008\projects\test\test\testclass.h(10) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int

Answer 1

添加#include <string>到你的头文件 testclass.h .