public class Complex{ private int real, imag;public Complex(int real,this.real = real;this.imag = imag; public Complex() this(e,o); public string tostring(){ return "("+this.real+"+"+this.imag+"i)"; public void add(Complex c){this.real += c.real;this.imag +=c.imag; public static Complex subtract(Complex c1, Complex c2){ return new Complex(c1.real-c2.real, c1.imag-c2.imag);public class Complex{ private int real, imag;public Complex(int real,this.real = real;this.imag = imag; public Complex() this(e,o); public string tostring(){ return "("+this.real+"+"+this.imag+"i)"; public void add(Complex c){this.real += c.real;this.imag +=c.imag; public static Complex subtract(Complex c1, Complex c2){ return new Complex(c1.real-c2.real, c1.imag-c2.imag);运行结果

这段代码是有问题的，因为有语法错误，无法通过编译。具体来说，以下几行代码存在语法错误：

public Complex(int real,this.real = real;this.imag = imag;
public Complex() this(e,o);
public string tostring(){

其中，构造方法 `Complex(int real,` 缺少了右大括号 `}`；在构造方法和默认构造方法中，缺少了参数列表；`tostring()` 方法的返回类型应该是 `String` 而不是 `string`。

此外，这段代码中存在重复定义的问题，因为 `public class Complex{...}` 这一行代码出现了两次。

由于这段代码无法通过编译，因此无法给出运行结果。如果您有其他问题或需要进一步帮助，请随时提出。

相关问题

把下面代码的运算符重载改为友元函数形式#include<iostream> using namespace std; class complex { private: double real; double imag; public: complex(double r = 0.0, double i = 0.0); void print(); complex operator -=(complex c); complex operator *=(complex c); complex operator /=(complex c); complex operator ++(); complex operator ++(int); }; complex::complex(double r, double i) { real = r; imag = i; } complex complex::operator -=(complex c) { complex temp; temp.real = real - c.real; temp.imag = imag - c.imag; real = temp.real; imag = temp.imag; return temp; } complex complex::operator *=(complex c) { complex temp; temp.real = real * c.real - imag * c.imag; temp.imag = real * c.imag + imag * c.real; real = temp.real; imag = temp.imag; return temp; } complex complex::operator /=(complex c) { complex temp; double d; d = c.real * c.real + c.imag * c.imag; temp.real = (real * c.real + imag * c.imag) / d; temp.imag = (c.real * imag - real * c.imag) / d; real = temp.real; imag = temp.imag; return temp; } complex complex::operator ++() { complex temp; temp.real = ++real; temp.imag = ++imag; return temp; } complex complex::operator ++(int) { complex temp(real, imag); real++; imag++; return temp; } void complex::print() { cout << real; if (imag >= 0) cout << '+'; cout << imag << 'i' << endl; } int main() { complex A(30, 40), B(15, 30),C; C = A.operator++(1); cout << "C=A++后，C为："; C.print(); cout << "A为："; A.print(); C = A.operator++(); cout << "C=++A后，C为："; C.print(); cout << "A为："; A.print(); A *= B; cout << "A*=B后，A为:"; A.print(); A /= B; cout << "A/=B后，A为: "; A.print(); cout << "B为："; B.print(); return 0; }

重载运算符改为友元函数的形式如下：

#include<iostream>
using namespace std;

class complex {
private:
    double real;
    double imag;
public:
    complex(double r = 0.0, double i = 0.0);
    void print();
    friend complex operator -=(complex& c1, const complex& c2);
    friend complex operator *=(complex& c1, const complex& c2);
    friend complex operator /=(complex& c1, const complex& c2);
    friend complex operator ++(complex& c);
    friend complex operator ++(complex& c, int);
};

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

complex operator -=(complex& c1, const complex& c2) {
    complex temp;
    temp.real = c1.real - c2.real;
    temp.imag = c1.imag - c2.imag;
    c1.real = temp.real;
    c1.imag = temp.imag;
    return temp;
}

complex operator *=(complex& c1, const complex& c2) {
    complex temp;
    temp.real = c1.real * c2.real - c1.imag * c2.imag;
    temp.imag = c1.real * c2.imag + c1.imag * c2.real;
    c1.real = temp.real;
    c1.imag = temp.imag;
    return temp;
}

complex operator /=(complex& c1, const complex& c2) {
    complex temp;
    double d;
    d = c2.real * c2.real + c2.imag * c2.imag;
    temp.real = (c1.real * c2.real + c1.imag * c2.imag) / d;
    temp.imag = (c2.real * c1.imag - c1.real * c2.imag) / d;
    c1.real = temp.real;
    c1.imag = temp.imag;
    return temp;
}

complex operator ++(complex& c) {
    complex temp;
    temp.real = ++c.real;
    temp.imag = ++c.imag;
    return temp;
}

complex operator ++(complex& c, int) {
    complex temp(c.real, c.imag);
    c.real++;
    c.imag++;
    return temp;
}

void complex::print() {
    cout << real;
    if (imag >= 0) cout << '+';
    cout << imag << 'i' << endl;
}

int main() {
    complex A(30, 40), B(15, 30), C;
    C = operator++(A, 1);
    cout << "C=A++后，C为：";
    C.print();
    cout << "A为：";
    A.print();
    C = operator++(A);
    cout << "C=++A后，C为：";
    C.print();
    cout << "A为：";
    A.print();
    A *= B;
    cout << "A*=B后，A为:";
    A.print();
    A /= B;
    cout << "A/=B后，A为: ";
    A.print();
    cout << "B为：";
    B.print();
    return 0;
}

需要注意的是，友元函数的参数中第一个参数需要加上引用符号 &，因为需要修改该对象的值。而第二个参数一般为 const 引用形式，以保证不会对该参数进行修改。另外，在调用友元函数时需要在函数名前加上 operator。

用C++给下面的代码写运行部分。class COMPLEX {private: double real; double imag;public: COMPLEX(double r = 0, double i = 0) : real(r), imag(i) {} COMPLEX operator+(const COMPLEX& rhs) const { return COMPLEX(real + rhs.real, imag + rhs.imag); } COMPLEX operator-(const COMPLEX& rhs) const { return COMPLEX(real - rhs.real, imag - rhs.imag); } COMPLEX& operator=(const COMPLEX& rhs) { real = rhs.real; imag = rhs.imag; return *this; }};

以下是用C++编写的运行部分：

#include <iostream>
using namespace std;

class COMPLEX {
private:
    double real;
    double imag;
public:
    COMPLEX(double r = 0, double i = 0) : real(r), imag(i) {}
    COMPLEX operator+(const COMPLEX& rhs) const {
        return COMPLEX(real + rhs.real, imag + rhs.imag);
    }
    COMPLEX operator-(const COMPLEX& rhs) const {
        return COMPLEX(real - rhs.real, imag - rhs.imag);
    }
    COMPLEX& operator=(const COMPLEX& rhs) {
        real = rhs.real;
        imag = rhs.imag;
        return *this;
    }
};

int main() {
    COMPLEX a(1, 2), b(3, 4), c;
    c = a + b;
    cout << c.real << " + " << c.imag << "i" << endl;
    c = a - b;
    cout << c.real << " + " << c.imag << "i" << endl;
    return 0;
}

在上述代码中，我们定义了一个名为`COMPLEX`的类，它表示一个复数，具有实部和虚部两个成员变量。我们使用构造函数初始化这两个成员变量，并且使用运算符重载函数`operator+`和`operator-`分别实现了复数的加法和减法。同时，我们也定义了一个赋值运算符`operator=`，用于将一个复数赋值给另一个复数。

在`main()`函数中，我们创建了两个复数对象`a`和`b`，并将它们相加和相减，将结果分别赋值给复数对象`c`。最后，我们输出了`c`的实部和虚部，以验证我们的代码是否正确。