Forward-referencing structures

/* 1907.c Forward-referencing structures */
#include <stdio.h>
/* forward-referencing structure,
It's not legal in C to use forward references in a typedef statement.*/
struct resume {
char name[16];
struct date *u;
struct date *g;
};
/* referenced structure */
struct date {
int year;
char school[32];
char degree[8];
};

typedef struct resume RSM;
typedef struct date DATE;

void InfoDisplay(RSM *ptr);

main(void)
{
    DATE under = {1985,"Rice University","B.S."};
    DATE graduate = {1987,"UT Austin","M.S."};
    RSM new_employee = {"Tony",&under,&graduate};

    printf("Here is the new employee's resume:\n");
    InfoDisplay(&new_employee);

    return 0;
}
/* function definition */
void InfoDisplay(RSM *ptr)
{
    printf("Name: %s\n", ptr->name);
    /* undergraduate */
    printf("School name: %s\n", ptr->u->school);
    printf("Graduation year: %d\n", ptr->u->year);
    printf("Degree: %s\n", ptr->u->degree);
    /* graduate */
    printf("School name: %s\n", ptr->g->school);
    printf("Graduation year: %d\n", ptr->g->year);
    printf("Degree: %s\n", ptr->g->degree);
}