函数：函数操作结构体通过按值传递以及按址传递，使用动态内存

struct student{
	char fullname[SLEN];
	char hobby[SLEN];
	short age;
};

使用动态内存创建此结构数组，使用函数进行输入，输出，显示的操作。

#include <iostream>

const size_t SLEN = 30;
struct student{
	char fullname[SLEN];
	char hobby[SLEN];
	short age;
};

size_t getinfo(student pa[], const size_t n);
void display1(student st);
void display2(const student *ps);
void display3(const student pa[], size_t n);

int main(void)
{
	using std::cin;
	using std::cout;
	
	cout << "Enter class size: ";
	size_t class_size;
	cin >> class_size;
	
	while(cin.get() not_eq'\n') continue;
	
	student *ptr_stu=new student[class_size];
	size_t entered = getinfo(ptr_stu, class_size);
	for(size_t i=0; i<entered; i++)
	{
		display1(ptr_stu[i]);
		display2(&ptr_stu[i]);
	}
	display3(ptr_stu, entered);
	cout << "Done\n";
	
	delete []ptr_stu;
	
	return 0;
}

size_t getinfo(student pa[],const size_t n)
{
	using std::cin;
	using std::cout;
	size_t i=0;
	
	cout << "Input datas to array(EOF to quit)\n";

	while((cin.eof()not_eq true) and (i < n))
	{
		student temp;
		cout << "Enter the student name:";
		cin.getline(temp.fullname, SLEN);
		cout << "Enter the student hobby:";
		cin.getline(temp.hobby, SLEN);
		cout << "Enter the student age:";
		cin >> temp.age; cin.get();
		
		if(not cin.eof())
		{
			pa[i++]=temp;
			cout << "\nnext";
		}
	}
	return i;
}
void display1(student st)
{
	std::cout << "\nstudent_name:" << st.fullname << std::endl 
	          << "student_hobby:"  <<st.hobby     << std::endl
		      << "student_age:"    <<st.age       << std::endl;
}
void display2(const student *ps)
{
	std::cout << "\nstudent_name:" << ps->fullname << std::endl 
	          << "student_hobby:"  << ps->hobby    << std::endl
		      << "student_age:"    << ps->age      << std::endl;
}
void display3(const student pa[], size_t n)
{
	for(size_t i=0; i<n; i++)
	{
		std::cout << "\nstudent_name:" << pa[i].fullname <<std::endl 
	              << "student_hobby:"  << pa[i].hobby    <<std::endl
		          << "student_age:"    << pa[i].age      <<std::endl;
	}
}