Thread: malloc() with array of structures

Ok...its been two days now and I can't get it yet! I googled for long hours but couldn't find what exactly I was looking for. So, here it is -

Say, I have a structure with only one element. (I'll add more elements to the structure once I get it to work!)

Code:

typedef struct
{
   int roll;
}STUDENT;

Now when the program is run, I want the user to specify the number of students and then allocate the necessary memory using malloc(). So, I did this -

Code:

    int num;
    REC *pt;
    pt= (REC *) malloc (num*sizeof(REC));  // I also tried this without casting!

Now, I am having difficulties in stroing the values and then displaying those values back to the screen. I used the following code -

Code:

	printf("\n* * * * Enter roll no of students. * * * *\n");
	for (i=0;i<num;i++)
	{
		printf("-->");
               scanf("%d",(pt+i)->roll);
	}

	printf("\n* * * * Entered roll no. * * * *\n");
	for (i=0;i<num;i++)
	{	
              printf("%d, ",*(pt+i)->roll);     //This is where the error occures!
	}

when I try do compile it, I get the error "invalid type argument of `unary *'".

How can I solve this?

P.S. I am using wxdev C++.