请帮小弟我看一下这程序

请帮我看一下这程序
#include "iostream.h"


struct complex{
  double r;
  double i;
};

complex add(complex c1, complex c2);

void out(complex &c);

void main(){
  complex tmp, c0={1,2},cA[5]={{3,6},{-3,-2},{2,-8},{-5,-8},{1,0}};
  for(int i=0; i<5; i++){
  tmp=add(c0,cA[i]);
  out(tmp);
}
}

complex add(complex c1, complex c2){
  int i;
c2[i].r=c1.r+c2[i].r;
  c2[i].i=c1.i+c2[i].i;
  return(c2);
}

void out(complex &c){
  for(int i=0; i<5; i++)
  cout<<"("<<c[i].r<<","<<c[i].i<<")"<<endl;
}

[解决办法]
return(c2);

add函数改变的是c2的拷贝，出了函数后，其拷贝就销毁了
[解决办法]
struct complex{ 
double r; 
double i; 
}; 

complex add(complex c1, complex c2); 

void out(complex &c); 

void main(){ 
complex tmp, c0={1,2},cA[5]={{3,6},{-3,-2},{2,-8},{-5,-8},{1,0}}; 
for(int i=0; i <5; i++){ 
tmp=add(c0,cA[i]); 
out(tmp); 
} 
} 

complex add(complex c1, complex c2){ 
// int i; 
c2.r=c1.r+c2.r; 
c2.i=c1.i+c2.i; 
return(c2); 
} 

void out(complex &c){ 
for(int i=0; i <5; i++) 
cout <<"("<<c.r <<"," <<c.i << ")" <<endl; 
}
[解决办法]
你的out函数的实现给弄丢了
[解决办法]
#include "stdafx.h"
#include <iostream.h> 


struct complex
{ 
double r; 
double i; 
}; 

complex add(complex c1, complex c2); 

void out(complex &c); 

void main()
{ 
complex tmp, c0={1,2},cA[5]={{3,6},{-3,-2},{2,-8},{-5,-8},{1,0}}; 
for(int i=0; i <5; i++)
{ 
tmp=add(c0,cA[i]); 
out(tmp); 
} 
} 

complex add(complex c1, complex c2)
{ 
int i; 
c2.r=c1.r+c2.r; 
c2.i=c1.i+c2.i; 
return(c2); 
} 

void out(complex &c)
{ 
for(int i=0; i <5; i++) 
cout <<"(" <<c.r <<"," <<c.i <<")" <<endl; 
}
[解决办法]
是啊是啊，void out(complex &c)函数声明了但是没有写实现呀～

C/C++ code

// test.cpp : 定义控制台应用程序的入口点。 
 // 
  
 #include "stdafx.h" 
  
 using namespace std; 
  
 struct complex{    
   double r;    
   double i;    
 };    
  
 complex add(complex c1, complex c2);    
  
 void out(complex &c);   
  
 int _tmain(int argc, _TCHAR* argv[]) 
 { 
 complex tmp, c0={1,2},cA[5]={{3,6},{-3,-2},{2,-8},{-5,-8},{1,0}};   
  
   for(int i=0; i    <5; i++) 
 {    
 tmp=add(c0,cA[i]);    
 out(tmp);   
 } 
  
 cin.get(); 
 return(0); 
 } 
  
  
 complex add(complex c1, complex c2){    
 //  int i;     
 
 c2.r=c1.r+c2.r;    
   c2.i=c1.i+c2.i;    
   return(c2);    
 }    
  
 void out(complex &c) 
 { 
 cout  < < "("  < < c.i  < < ","  < < c.r  < < ") " ; 
 }