Thread: how to know dynamic size of struct

Dear all,

Suppose i have a program that is consisted of a struct. this struct will be used as an array.

Code:

typedef struct 
{
	char name[30];
	int salary;
} person;

How do i define an flexible array for this struc ? i don't know how many arrays which i need yet.

and how can i calculate the sum of all person salary ?

I wrote the simple code, but i think not solve my problem

Code:

#include <stdio.h>

typedef struct 
{
	char name[30];
	int salary;
} person;


int sumStructs(person*, int);

main(void)
{
	person a[10], *pa;                   /* I still put non flexible array*/
	pa = a;
	int i = 0;
	for(i=0; i< 10; i++)
	{
		a[i].i = i+1;
	}
	
	int d = sizeof(a)/sizeof(person);
	
	int c = sumStructs(pa, d);

	printf("sum i adalah %d \n",c);
}

int sumStructs(person*pa, int d)
{

	int sum = 0, j= 0;
	while(j<d)
	{
		sum += (*pa).i;
		pa++;
		j++;
	}
	return sum;
}