How to use realloc in a function in C

Question

Building on what I learned here: Manipulating dynamic array through functions in C.

void test(int data[])
{
    data[0] = 1;    
}    

int main(void)
{    
         


        

Answer 1

Both code are very problematic, if you use the same pointer to send and receive from realloc, if it fails, you will lose your pointer to free it later.

you should do some thing like this :

{ ... ...

more = realloc(area , size);
if( more == NULL )
    free(area);
else
    area=more;

... ...

}