I have alloted this struct by dynamic allocation and can only access the data idade via arrow and not by point wanted to know why?
#include<stdio.h>
#include <stdlib.h>
struct pessoa
{
int idade;
};
void alteraIdade(struct pessoa *l);
int main(int argc, char** argv)
{
struct pessoa *jose = malloc(sizeof(int));
alteraIdade(jose);
printf("%d\n", jose->idade);
free(jose);
return 0;
}
void alteraIdade(struct pessoa *l)
{
l->idade = 90;
}
Because it is accessed through a pointer, then you need to derrefer the pointer before accessing the member.
jose is a pointer to an object and not the object itself, it is a number with the address. To get the object itself you have to say that you want it, using the * operator and then with the object you can get its member. Then you need to (*jose).idade . As this is quite common they have created a simpler syntax jose->idade , which is the same thing.