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Flexible Array Members in a structure in C
Flexible Array members in a structure in C means we can declare array without its dimension within a structure and its size will be flexible in nature. Flexible array member must be the last member of class.
Here is an example:
Example
#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
" "Employee Name : %s
" "Name Length: %d
", 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
",
sizeof(struct employee));
return 0;
}Output
Employee_id : 26 Employee Name : Ram Name Length: 3 Employee_id : 53 Employee Name : Madhu Name Length: 5 Size of structure Employee: 12
Updated on: 30-Jul-2019
1K+ Views
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