Question

这个复数编号程序应该从txt文档中取三个参数，第一个指示后续的两个是极坐标还是矩形的数字，并输出矩形和极坐标形式的每个复数。头文件和源代码都显示在这里。 txt文档采用以下格式：

p 50 1.2
r 4 0.8
r 2 3.1
p 46 2.9
p 3 5.6

如果没有在类声明中将int inputfile（）函数声明为静态，则构建会给出非法调用非静态成员函数的错误＆＃39;。

使用函数的静态声明（如下所示），构建会在函数定义inputfile（）内引用类成员Pfirst，Psecond，Rfirst和Rsecond时出错，是对非静态成员的非法引用＆＃39 ;.

然后，成员声明也不能变为静态，因为该类将无法初始化构造函数中的参数。

如何绕过这种静态＆＃39;问题

#define Complex_h

class Complex
{
    char indicator;

    const double pi;


public:
    double Pfirst, Psecond, Rfirst, Rsecond;
    Complex(char i = 0, double Pf = 0, double Ps = 0, double Rf = 0, double Rs = 0, const double pi = 3.14159265) // with default arguments (= 0)
        : indicator(i), Pfirst(Pf), Psecond(Ps), Rfirst(Rf), Rsecond(Rs), pi(pi) {}
    ~Complex();
    void poltorect();
    void recttopol();
    static int inputfile();
};





#include <iostream>
#include <iomanip>
#include <fstream>
#include <sstream>
#include <string>
#include "Complex.h"
using namespace std;


int Complex::inputfile()
{
    ifstream ComplexFile;
    ComplexFile.open("PolarAndRectangular.txt");
    string TextArray[3];
    string TextLine;
    stringstream streamline, streamfirst, streamsecond;
    while (getline(ComplexFile,TextLine))
        {
            streamline << TextLine;
            for (int j=0; j<3; j++)
            {streamline >> TextArray[j];}
            streamline.str("");
            streamline.clear();
            if (TextArray[0] == "r") 
            {
                streamfirst << TextArray[1];
                streamfirst >> Rfirst;
                streamsecond << TextArray[2];
                streamsecond >> Rsecond;
                cout << "Complex number in rectangular form is " << Rfirst << "," << Rsecond << endl;
                void recttopol();
                cout << "Complex number in polar form is " << Pfirst << "," << Psecond << endl;
            }
            else 
            {   
                streamfirst << TextArray[1];
                streamfirst >> Pfirst;
                streamsecond << TextArray[2];
                streamsecond >> Psecond;
                cout << "Complex number in polar form is " << Pfirst << "," << Psecond << endl;
                void poltorect();
                cout << "Complex number in rectangular form is" << Rfirst << "," << Rsecond << endl;
            }
            streamfirst.str("");
            streamfirst.clear();
            streamsecond.str("");
            streamsecond.clear();
        }
    ComplexFile.close();
    system("pause");
    return 0;
}   


void Complex::recttopol()
{
     Pfirst = sqrt((Rfirst*Rfirst)+(Rsecond*Rsecond));
     Psecond = (atan(Rsecond/Rfirst))*(pi/180);
 }

void Complex::poltorect()
{
    Rfirst = Pfirst*(cos(Psecond));
    Rsecond = Pfirst*(sin(Psecond));
}



int main()
{
    Complex::inputfile();
    system("pause");
    return 0;
}

Answer 1

您忘记创建Complex类型的对象。

使您的inputfile()方法非静止并执行：

int main()
{
    Complex complex; // Object construction.
    complex.inputfile();
    system("pause");
    return 0;
}

C ++非静态成员引用必须与特定对象相关

1 个答案: