#include<iostream.h>
struct student{
char name[10];
int age;
long id;
char address[50];};
void input(student stu)
{
cout<<"input name age num and adress:\n";
cin>>stu.name>>stu.age>>stu.id>>stu.address;
return(stu);
}
void output(student stu)
{
cout<<"name="<<stu.name<<"\tage="<<stu.age<<"\tnum="<<stu.id<<"\taddress="<<stu.address<<'\n';
}
void main()
{
student stu;
input(stu);
output(stu);
}

#include<iostream.h>
struct student{
char name[10];
int age;
long id;
char address[50];};
student input(student stu)
{
cout<<"input name age num and adress:\n";
cin>>stu.name>>stu.age>>stu.id>>stu.address;
return(stu);
}
void output(student stu)
{
cout<<"name="<<stu.name<<"\tage="<<stu.age<<"\tnum="<<stu.id<<"\taddress="<<stu.address<<'\n';
}
void main()
{
student stu;
stu=input(stu);
output(stu);
}
函数如果有返回值就一定不是void型的,另外你的main中也写错了.

谢谢了 哈哈 我又改了一下 哈哈改成没有引用的了 哈哈刚学
#include<iostream.h>
struct student{
char name[10];
int age;
long id;
char address[50];};
student input()
{
student stu;
cout<<"input name age num and adress:\n";
cin>>stu.name>>stu.age>>stu.id>>stu.address;
return(stu);
}
student output(student stu)
{
cout<<"name="<<stu.name<<"\tage="<<stu.age<<"\tnum="<<stu.id<<"\taddress="
<<stu.address<<'\n';
return(stu);
}
void main()
{
student stu;
stu=input();
output(stu);
}

好像错误比较多哦！！！