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

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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;}}

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