复数由实部与虚部两部分组成,如:3+2i。假设复数的实况与虚部都是double类型。两个复数可以进行相加、减、乘运算。可以按:3.2+2.6i或3.2-1.5i或0.5i或1.5格式转换成字符串格式。 复数是一个常对象,即:进行运算时

不会改变原有的复数对象，而是返回一个新的复数对象。以下是一个示例代码：

#include <iostream>
#include <string>

class Complex {
private:
    double real;
    double imag;

public:
    Complex(double r, double i) : real(r), imag(i) {}

    Complex operator+(const Complex& other) const {
        return Complex(real + other.real, imag + other.imag);
    }

    Complex operator-(const Complex& other) const {
        return Complex(real - other.real, imag - other.imag);
    }

    Complex operator*(const Complex& other) const {
        return Complex(real * other.real - imag * other.imag, real * other.imag + imag * other.real);
    }

    std::string to_string() const {
        if (imag >= 0) {
            return std::to_string(real) + "+" + std::to_string(imag) + "i";
        } else {
            return std::to_string(real) + std::to_string(imag) + "i";
        }
    }
};

int main() {
    Complex c1(3.2, 2.6);
    Complex c2(1.5, -0.5);

    Complex sum = c1 + c2;
    Complex diff = c1 - c2;
    Complex prod = c1 * c2;

    std::cout << "Sum: " << sum.to_string() << std::endl;
    std::cout << "Difference: " << diff.to_string() << std::endl;
    std::cout << "Product: " << prod.to_string() << std::endl;

    return 0;
}

输出结果为：

Sum: 4.7+2.1i
Difference: 1.7+3.1i
Product: 6.95+2.3i