On the assignment problem of the structure body array

I've been practicing Pat's questions recently, there are a lot of string data that needs to be stored using a two-dimensional string array, which is not very convenient to handle, and if the data to be stored is normalized for each row, consider using one-dimensional array of structures to process, and the following is a summary of the use of one-dimensional structure arrays:

Considering many topics the number of data in each test case is not certain, in other words, to use a variable-length one-dimensional structure array, the malloc function is used to dynamically request memory space:

1. First/define the structure body:

typedef struct {

Char id[20];

Char name[10];

Char gender[4];

} student;

2. Make a declaration in the main function:

int N;

scanf ("%d", &n);//Get array length

Student * Students = (student *) malloc (N * sizeof (student));

In compilers that support C99 standards, you can declare them directly by using the following methods:

Student Students[n];

3. About assigning values to an array of structures:

(1) directly using the For loop for the assignment of the struct body:

int i;

for (i = 0; i < N; i++)

{

If the structure is not a string, for example if the ID is an int, then the &students[i].id

scanf ("%s%s%s", Students[i].id,students[i].name,students[i].gender);

}

(2) by creating a new structure within the assignment function and returning the assignment:

In Main ():

int i;

Char id[20],name[10],gender[4];

for (i = 0; i < N; i++)

{

Students[i] = getstruct ();

}

struct Body Assignment function:

Student getstruct (void)

{

Student p;

scanf ("%s", p.id);//Because it is a string, you do not need to add an address character, otherwise this is &p.x

scanf ("%s", p.name);

scanf ("%s", P.gender);

return p;

}

(3) Assigning values through pointers:

In Main ():

int i;

Char id[20],name[10],gender[4];

for (i = 0; i < N; i++)

{

Getstruct (&students[i]);

}

struct Body Assignment function:

void Getstruct (Student * students)

{

scanf ("%s", students->id);//Because it is a string, it is not an int, this is &students->id

scanf ("%s", students->name);

scanf ("%s", Students->gender);

}