c++ - 从 C++ 文件中读取和写入复数（从 C 翻译）？

问题描述

我有一个大问题。我得到一个任务，我应该用 C++ 编写一个程序，我以前用 C 编写过这个程序。这个 C++ 程序必须从文件中读取复数并写入它们。我必须创建一个类，实部和虚部必须是私有的。我还必须创建运算符 << 和 >>。我不知道我应该怎么做。这是我的输入文件 data.txt

(2.3,5) (7.12,-2.91) (7.99,8)
(5,3.25)

我的输出文件应该是 result.txt

2.3, 5
7.12 -2.91

在 CI 中使用这些函数

void readZ(FILE *wp, double *a, double *b)
{
    char c;  
    assert(fscanf(wp,"%c%lg%c%lg%c%c",&c,a,&c,b,&c,&c));

}
int writeZ(FILE *wp, double complex z)
{    
    fprintf(wp, "%.2f, %.2f\n", creal(z), cimag(z));

    return 1;
}

现在我必须在 C++ 中执行此操作这是我的代码 main.cpp

#include <iostream>
#include <fstream>
#include <cstdlib> 
#include "read.h"

using namespace std;

int main(int argc, char* argv[])
{
    ifstream inFile;
    ostream  outFile;

    char c;
    ifstream read(argv[1]);
    if (!read)
        { cerr << "Open error: " << argv[1] << endl; exit(1);}
    ofstream write(argv[2]);
    if(!write) { cerr << "Open error: " << argv[2] << endl; exit(2);}
    while(read.get(c)) 
        write.put(c);

    Complex_num x1;
    read >> x1;
    write << x1;

    inFile.close();
    outFile.close();

    return 0;
}

读.h

#include <iostream>
#include <fstream>
#include <cstdlib> 

using namespace std;

class Complex_num {
    double real, imag;
public:
    Complex_num(){
    real=0;
    imag=0;
    }


    friend std::ostream& operator<<(std::ostream&, const Complex_num&)
    {
        cout << real << '.' << imag << ',' << ' ';
    }
    friend std::istream& operator>>(std::istream&, Complex_num&){
        char c;
        cin>>c>>&real>>c>>&imag>>c>>c; 
    }
};

读取.cpp

#include <iostream>
#include <fstream>
#include <cstdlib> 
#include "read.h"

using namespace std;

Complex_num::Complex_num(double r, double i)
{
    real=r;
    imag=i;
}

我有很多错误，我什至不知道我应该做什么

g++ -c read.cpp -Wall
In file included from read.cpp:4:0:
read.h: In function ‘std::ostream& operator<<(std::ostream&, const Complex_num&)’:
read.h:18:17: error: invalid use of non-static data member ‘Complex_num::real’
         cout << real << '.' << imag << ',' << ' ';
                 ^~~~
read.h:8:12: note: declared here
     double real, imag;
            ^~~~
read.h:18:32: error: invalid use of non-static data member ‘Complex_num::imag’
         cout << real << '.' << imag << ',' << ' ';
                                ^~~~
read.h:8:18: note: declared here
     double real, imag;
                  ^~~~
read.h:19:5: warning: no return statement in function returning non-void [-Wreturn-type]
     }
     ^
read.h: In function ‘std::istream& operator>>(std::istream&, Complex_num&)’:
read.h:22:18: error: invalid use of non-static data member ‘Complex_num::real’
         cin>>c>>&real>>c>>&imag>>c>>c;
                  ^~~~
read.h:8:12: note: declared here
     double real, imag;
            ^~~~
read.h:22:28: error: invalid use of non-static data member ‘Complex_num::imag’
         cin>>c>>&real>>c>>&imag>>c>>c;
                            ^~~~
read.h:8:18: note: declared here
     double real, imag;
                  ^~~~
read.h:23:5: warning: no return statement in function returning non-void [-Wreturn-type]
     }
     ^
read.cpp: At global scope:
read.cpp:8:1: error: prototype for ‘Complex_num::Complex_num(double, double)’ does not match any in class ‘Complex_num’
 Complex_num::Complex_num(double r, double i)
 ^~~~~~~~~~~
In file included from read.cpp:4:0:
read.h:7:7: error: candidates are: constexpr Complex_num::Complex_num(Complex_num&&)
 class Complex_num {
       ^~~~~~~~~~~
read.h:7:7: error:                 constexpr Complex_num::Complex_num(const Complex_num&)
read.h:10:5: error:                 Complex_num::Complex_num()
     Complex_num(){
     ^~~~~~~~~~~

标签： c++classoopio

friend std::ostream& operator<<(std::ostream& os, const Complex_num& c) { os << c.real << '.' << c.imag << ',' << ' '; return os; } friend std::istream& operator>>(std::istream& is, Complex_num& cn){ char c; is>>c>>cn.real>>c>>cn.imag>>c>>c; return is; }

c++ - 从 C++ 文件中读取和写入复数（从 C 翻译）？

问题描述

解决方案

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