为struct动态分配内存 [英] Dynamically allocate memory for struct

问题描述

我采取一个C ++类，并有一个赋值，需要我动态分配内存的结构。我不记得有没有在课堂上讨论这个问题，我们只是简单地触及 new 运算符。现在我必须

动态分配学生，然后提示用户输入学生的名字，姓氏和A-号码（ID号） p>

my struct的写法如下：

  struct Student 
 {
 string firstName，lastName，aNumber; 
 double GPA; 
}; 
  
 
 
我试过 Student student1 = new Student; 但是这不工作，我不确定如何使用一个结构动态。
解决方案
 
  struct Student Student 
 {
 string firstName，lastName，aNumber; 
 double GPA; 
}; 
  
 注意我已经改变了struct关键字 
 
 
而你必须 Student * student1 = new Student 。
 
 
 
当你为结构动态分配内存时，你得到一个结构的指针。
 
 
 
一旦你完成了学生记住要通过执行 delete student1 来释放动态分配的内存。您可以使用 std :: shared_ptr 自动管理动态分配的内存。
 
I am taking a C++ class and have a assignment which requires me to dynamically allocate memory for a struct.  I don't recall ever going over this in class and we only briefly touched on the  new operator before going on to classes. Now I have to 

"Dynamically allocate a student and then prompts the user for student’s first name, a last name, and A - number(ID number). " 

my struct is written like
struct Student
{
    string firstName, lastName, aNumber;
    double GPA;
};
I tried Student student1 = new Student; but that doesn't work and I'm unsure as how I do this dynamically with a struct.
解决方案
Change you definition to
struct Student 
{
    string firstName, lastName, aNumber;
    double GPA;
};
Notice I have changed the placement of the struct keyword

and you have to do Student* student1 = new Student instead.

When you dynamically allocated memory for a struct you get a pointer to a struct.

Once you are done with the Student you also have to remember to to release the dynamically allocated memory by doing a delete student1.  You can use a std::shared_ptr to manage dynamically allocated memory automatically.

                        
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