问题描述：分别使用结构和类编程实现复数加减法

/*使用复数结构，编写通用函数求两个复数的和和积*/
struct complex
{
    int real;
    int im;
};

struct complex cadd(struct complex c1,struct complex c2);
struct complex cadd(struct complex c1,struct complex c2) 
//现在cadd是一个返回类型是struct complex的函数
{
    struct complex result;
    result.real=c1.real+c2.real;
    result.im=c1.im+c2.im;
    return result;

}

struct complex cmult(struct complex c1, struct complex c2);

struct complex cmult(struct complex c1, struct complex c2)
{
    struct complex result;
    result.real = c1.real*c2.real - c1.im*c2.im;
    result.im = c1.real*c2.im + c1.im*c2.real;
    return result;
}

//编写结果输出函数
void puts(struct complex c);
void puts(struct complex c)
{
    cout<
  
   >c1.real&&cin>>c1.im&&cin>>c2.real&&cin>>c2.im)
    {
        c3=cadd(c1,c2);
        puts(c3);
        c3=cmult(c1,c2);
        puts(c3);
    }
    cin.get();
}
  

/*用类来实现复数的加法和乘法*/

class complex
{
public:
    int real;
    int im;
//   complex(int m=0,int n=0);

    void set_c(int m,int n);
    void cadd(complex c1, complex c2);
    void cmult(complex c1,complex c2);
    void put();
};

//complex::complex(int m,int n)
//{
//  real = m;
//  im = n;
//}

void complex::set_c(int m, int n)
{
    real = m; 
    im = n;
}
void complex::cadd(complex c1, complex c2)
{
    real = c1.real + c2.real;
    im = c1.im + c2.im;
}

void complex::cmult(complex c1,complex c2)
{   
    real = c1.real*c2.real - c1.im*c2.im;
    im = c1.real *c2.im + c2.real*c1.im;
}
void complex::put()
{
    cout<
  
   >r1 && cin>>i1 &&cin>>r2 &&cin>>i2)
    {
        c1.set_c(r1,i1);
        c1.put();
        c2.set_c(r2,i2);
        c2.put();
        c3.cadd(c1,c2);
        c3.put();
        c3.cmult(c1,c2);
        c3.put();
    }
    cin.get();
}