封装一个复数类CPLX，用来处理复数功能和运算，支持以下操作： 1. CPLX::CPLX()构造：初始化一个实部、虚部均为0的复数，产生一行以“CREATE()”开始的输出，并输出复数的实部和虚部； 2. CPLX::~CPLX()析构：产生一行以“RELEASE()”开始的输出，并输出复数的实部和虚部； 3. CPLX::real()：返回实部； CPLX::imag()：返回虚部。 4. CPLX::real(double)：传参修改实部； CPLX::imag(double)：传参修改虚部； ----------------------------------------------------------------------------- 你设计一个CPLX类，使得main()函数能够运行并得到正确的输出。调用格式见append.ccint main() { int cases; cin >> cases; for(int i = 1; i <= cases; ++i) { double a, b; cin >> a >> b; cout << "=========================" << endl; CPLX cplx; cplx.real(a); cplx.imag(b); cout << "Complex real part is " << cplx.real() <<", imaginary part is " << cplx.imag() << "." << endl; } cout << "=========================" << endl; }

以下是CPLX类的实现：

#include <iostream>

using namespace std;

class CPLX {
private:
    double real_part;
    double imag_part;

public:
    CPLX() : real_part(0), imag_part(0) {
        cout << "CREATE()" << endl;
        cout << "Complex real part is " << real_part << ", imaginary part is " << imag_part << "." << endl;
    }

    CPLX(double real, double imag) : real_part(real), imag_part(imag) {
        cout << "CREATE()" << endl;
        cout << "Complex real part is " << real_part << ", imaginary part is " << imag_part << "." << endl;
    }

    ~CPLX() {
        cout << "RELEASE()" << endl;
        cout << "Complex real part is " << real_part << ", imaginary part is " << imag_part << "." << endl;
    }

    double real() const {
        return real_part;
    }

    double imag() const {
        return imag_part;
    }

    void real(double real) {
        real_part = real;
    }

    void imag(double imag) {
        imag_part = imag;
    }
};

其中，CPLX类有两个私有变量：实部和虚部。构造函数有两种，一种是默认构造函数，实部和虚部都为0；另一种是带参数的构造函数，可以传入实部和虚部的值。析构函数会输出释放的信息和当前实部和虚部的值。real()和imag()函数分别返回实部和虚部的值，而real(double)和imag(double)函数则可以传入参数修改实部和虚部的值。

可以按照以下调用方式测试CPLX类：

int main() {
    int cases;
    cin >> cases;
    for(int i = 1; i <= cases; i++) {
        double a, b;
        cin >> a >> b;
        cout << "=========================" << endl;
        CPLX cplx;
        cplx.real(a);
        cplx.imag(b);
        cout << "Complex real part is " << cplx.real() <<", imaginary part is " << cplx.imag() << "." << endl;
    }
    cout << "=========================" << endl;
    return 0;
}