c++问题 到底是哪里出错了

#include"iostream"
using namespace std;
struct box{
char maker[40];#include"iostream"
using namespace std;
struct box{
char maker[40];
float height;
float width;
float length;
float volume;
}
void showstruct(struct box v);
int main()
{

struct box t1={ "hello123",
5,
4,
2,
40
};

showstruct(t1);
return 0;
}
void showstruct(struct box v)
{ using namespace std;
cout<<v.maker<<endl;
cout<<v.height<<endl;
cout<<v.width<<endl;
cout<<v.length<<endl;
cout<<v.volume<<endl;
}

float height;
float width;
float length;
float volume;
}
void showstruct(struct box v);
int main()
{

struct box t1={ "hello123",
5,
4,
2,
40
};

showstruct(t1);
return 0;
}
void showstruct(struct box v)
{ using namespace std;
cout<<v.maker<<endl;
cout<<v.height<<endl;
cout<<v.width<<endl;
cout<<v.length<<endl;
cout<<v.volume<<endl;
}
下面 是编译器编译的结果：
g++ 5.cpp
5.cpp:3:1: error: new types may not be defined in a return type
5.cpp:3:1: note: (perhaps a semicolon is missing after the definition of ‘box’)
5.cpp:10:29: error: two or more data types in declaration of ‘showstruct’
5.cpp: In function ‘int main()’:
5.cpp:21:14: error: ‘showstruct’ was not declared in this scope
#include"iostream"
using namespace std;
struct box{
char maker[40];
float height;
float width;
float length;
float volume;
}
void showstruct(struct box v);
int main()
{

struct box t1={ "hello123",
5,
4,
2,
40
};

showstruct(t1);
return 0;
}
void showstruct(struct box v)
{ using namespace std;
cout<<v.maker<<endl;
cout<<v.height<<endl;
cout<<v.width<<endl;
cout<<v.length<<endl;
cout<<v.volume<<endl;
}

你这段代码而言，具体的错误就是：
struct box{
char maker[40];
float height;
float width;
float length;
float volume;
}
这个结构体定义后边漏掉了一个分号";"

#include"iostream" using namespace std; struct box{ char maker[40]; float height; float width; float length; float volume; }; void showstruct(struct box v); int main() { struct box t1={ "hello123", 5, 4, 2, 40 }; showstruct(t1); return 0; } void showstruct(struct box v) { using namespace std; cout<<v.maker<<endl; cout<<v.height<<endl; cout<<v.width<<endl; cout<<v.length<<endl; cout<<v.volume<<endl; } 定义结构体后加分号

错在这句

sout<<item1+item2<<endl;

把 sout 改成 cout