Cの構造体の柔軟な配列メンバー

Cの構造体の柔軟な配列メンバーは、構造体内の次元なしで配列を宣言でき、そのサイズは本質的に柔軟であることを意味します。柔軟な配列メンバーは、クラスの最後のメンバーである必要があります。

次に例を示します：

例

#include
#include
#include
//structure of type employee and must contain at least one more named member
in addition to the flexible array member.
struct employee
{
   int emp_id;
   int name_len;
   int emp_size; //‘emp_size’ variable is used to store the size of flexible
   character array emp_name[].
   char emp_name[]; //Flexible array member emp_name[] should be the last member of class.
};
struct employee *createEmployee(struct employee *e, int id, char a[])
{
   e = (struct employee *)malloc( sizeof(*e) + sizeof(char) * strlen(a)); //memory allocation
   e->emp_id = id;
   e->name_len = strlen(a);
   //Assigning size according to size of emp_name which is a copy of user provided
   array a[].
   strcpy(e->emp_name, a);
   return e;
}
void printEmployee(struct employee *e) //print the details of the employee.
{
   printf("Employee_id : %d\n" "Employee Name : %s\n" "Name Length: %d\n\n", e->emp_id, e->emp_name, e->name_len);
}
int main()
{
   struct employee *e1 = createEmployee(e1, 26, "Ram");
   struct employee *e2 = createEmployee(e2, 53, "Madhu");
   printEmployee(e1);
   printEmployee(e2);
   printf("Size of structure Employee: %lu\n",
   sizeof(struct employee));
   return 0;
}

出力

Employee_id : 26
Employee Name : Ram
Name Length: 3
Employee_id : 53
Employee Name : Madhu
Name Length: 5
Size of structure Employee: 12