实验要求: (1)用C语言实现这个抽象数据类型Complex (2)代码组织方式为complex.h头文件，complex.cpp实现源文件，main.cpp为测试源文件(3)编写代码测试抽象数据类型Complex （4）实现复数的加减乘除

在C语言中，为了实现复数这一抽象数据类型（ADT），你可以按照以下步骤创建`complex.h`头文件和`complex.cpp`实现源文件：

**complex.h** (头文件)

#ifndef COMPLEX_H
#define COMPLEX_H

typedef struct {
    double real;
    double imag;
} Complex;

// 复数的基本操作：构造函数、获取实部和虚部、赋值操作
Complex create_complex(double real, double imag);
double get_real(const Complex *c);
double get_imaginary(const Complex *c);
void set_complex(Complex *c, double real, double imag);

// 复数的算术运算：加法、减法、乘法、除法
Complex add_complex(const Complex &c1, const Complex &c2);
Complex subtract_complex(const Complex &c1, const Complex &c2);
Complex multiply_complex(const Complex &c1, const Complex &c2);
Complex divide_complex(const Complex &c1, const Complex &c2);

#endif // COMPLEX_H

**complex.cpp** (实现源文件)

#include "complex.h"

// 构造函数和成员访问函数实现
Complex create_complex(double real, double imag) {
    Complex c = {real, imag};
    return c;
}

double get_real(const Complex *c) {
    return c->real;
}

double get_imaginary(const Complex *c) {
    return c->imag;
}

void set_complex(Complex *c, double real, double imag) {
    c->real = real;
    c->imag = imag;
}

// 算术运算函数的具体实现
Complex add_complex(const Complex &c1, const Complex &c2) {
    double real = c1.real + c2.real;
    double imag = c1.imag + c2.imag;
    return create_complex(real, imag);
}

Complex subtract_complex(const Complex &c1, const Complex &c2) {
    double real = c1.real - c2.real;
    double imag = c1.imag - c2.imag;
    return create_complex(real, imag);
}

Complex multiply_complex(const Complex &c1, const Complex &c2) {
    double real = c1.real * c2.real - c1.imag * c2.imag;
    double imag = c1.real * c2.imag + c1.imag * c2.real;
    return create_complex(real, imag);
}

Complex divide_complex(const Complex &c1, const Complex &c2) {
    if (c2.real == 0 && c2.imag == 0) {
        // 防止除数为零的情况
        printf("Error: Division by zero is not allowed.\n");
        return (Complex){NaN, NaN}; // 使用Not a Number代替
    }
    double denominator = c2.real * c2.real + c2.imag * c2.imag;
    double real = (c1.real * c2.real + c1.imag * c2.imag) / denominator;
    double imag = (c1.imag * c2.real - c1.real * c2.imag) / denominator;
    return create_complex(real, imag);
}

**main.cpp** (测试源文件)

#include <stdio.h>
#include "complex.h"

int main() {
    Complex c1 = create_complex(2.5, 3.7);
    Complex c2 = create_complex(-1.8, 2.9);

    // 测试复数运算
    Complex sum = add_complex(c1, c2);
    printf("Sum: (%lf, %lf)\n", get_real(&sum), get_imaginary(&sum));

    Complex diff = subtract_complex(c1, c2);
    printf("Difference: (%lf, %lf)\n", get_real(&diff), get_imaginary(&diff));

    Complex prod = multiply_complex(c1, c2);
    printf("Product: (%lf, %lf)\n", get_real(&prod), get_imaginary(&prod));

    Complex quot = divide_complex(c1, c2); // 注意处理除零情况
    printf("Quotient: (%lf, %lf)\n", get_real(&quot), get_imaginary(&quot));

    return 0;
}

运行 `main.cpp` 会测试你编写的复数 ADT 功能。