# C++ 中的結構和函數 > 原文： [https://beginnersbook.com/2017/09/cpp-structure-and-function/](https://beginnersbook.com/2017/09/cpp-structure-and-function/) 在[之前的教程](https://beginnersbook.com/2017/09/cpp-structures/)中，我們了解了結構，即對不同類型的變量進行分組的復合數據類型。在本教程中，我們將學習如何將結構作為參數傳遞給函數以及如何從函數返回結構。 ## 如何將結構作為參數傳遞給函數 這里我們有一個函數`printStudentInfo()`，它將結構`Student`作為參數，并使用結構變量打印學生的詳細信息。這里需要注意的重點是，您應該始終在函數聲明之前聲明結構，否則您將收到編譯錯誤。 ```cpp #include <iostream> using namespace std; struct Student{ char stuName[30]; int stuRollNo; int stuAge; }; void printStudentInfo(Student); int main(){ Student s; cout<<"Enter Student Name: "; cin.getline(s.stuName, 30); cout<<"Enter Student Roll No: "; cin>>s.stuRollNo; cout<<"Enter Student Age: "; cin>>s.stuAge; printStudentInfo(s); return 0; } void printStudentInfo(Student s){ cout<<"Student Record:"<<endl; cout<<"Name: "<<s.stuName<<endl; cout<<"Roll No: "<<s.stuRollNo<<endl; cout<<"Age: "<<s.stuAge; } ``` **輸出：** ```cpp Enter Student Name: Rick Enter Student Roll No: 666123 Enter Student Age: 19 Student Record: Name: Rick Roll No: 666123 Age: 19 ``` ## 如何從函數返回結構 在這個例子中，我們有兩個[函數](https://beginnersbook.com/2017/08/cpp-functions/)，一個從用戶獲取值，將它們賦值給結構成員并返回結構，另一個函數將該結構作為參數并打印細節。 ```cpp #include <iostream> using namespace std; struct Student{ char stuName[30]; int stuRollNo; int stuAge; }; Student getStudentInfo(); void printStudentInfo(Student); int main(){ Student s; s = getStudentInfo(); printStudentInfo(s); return 0; } /* This function prompt the user to input student ?* details, stores them in structure members ?* and returns the structure ?*/ Student getStudentInfo(){ Student s; cout<<"Enter Student Name: "; cin.getline(s.stuName, 30); cout<<"Enter Student Roll No: "; cin>>s.stuRollNo; cout<<"Enter Student Age: "; cin>>s.stuAge; return s; } void printStudentInfo(Student s){ cout<<"Student Record:"<<endl; cout<<"Name: "<<s.stuName<<endl; cout<<"Roll No: "<<s.stuRollNo<<endl; cout<<"Age: "<<s.stuAge; } ``` 輸出： ```cpp Enter Student Name: Tyrion lannister Enter Student Roll No: 333901 Enter Student Age: 39 Student Record: Name: Tyrion lannister Roll No: 333901 Age: 39 ```