Question

编译器说 [Linker error] undefined reference to `WinMain@16' ld returned 1 exit status 怎么修改

#include <iostream>
using namespace std;
struct Doubletree
{
char data;
struct Doubletree*lefttree;
struct Doubletree*righttree;
};

Doubletree*buildtree()
{

Doubletree*T;

char p;
cout<<"please input a number"<<endl;
cin>>p;

if(p=='a')
T=NULL;
else
{
T->data=p;
T->lefttree=buildtree();
T->righttree=buildtree();
}
return T;

}
void print(char p,int&count)
{
cout<<p<<endl;
count++;
};
void iter(Doubletree*T,int&count)
{
if(T)
{
print(T->data,count);

iter(T->lefttree, count);
iter(T->righttree, count);
}
};
int man()
{

int count=0;
Doubletree*T;
T=buildtree();
iter(T,count);
cout<<"the number is"<<count<<endl;
system("pause");
return 0;
}

Answer 1

以编译器的意思是说你少定义了某个头文件， 但其实是打错了字
man()改成main()

对你的代码某个部分优化：
Doubletree*T=NULL;

char p;
cout<<"please input a number"<<endl;
cin>>p;

if(p=='a')；
else
{
T->data=p;
T->lefttree=buildtree();
T->righttree=buildtree();
}
return T;

这只解决了链接问题，其实还有问题，估计用了指针中保存的变量地址了，程序运行一会儿就崩溃 。

Answer 2

这是工程选得不合适。
如果你书写的不是 Win32 GUI 代码，请选择 console 工程类型。