Source:
#include "/home/cordless/chomework/headerlib/dbstruct.h"

int main() {

struct person read_database[10];

FILE *dbfile;
int i;

dbfile=fopen("mycensus.dat","rb");

fread(read_database,sizeof(struct people),10,dbfile);

	for (i=0;i<10;i++) {
		printf("Name: %s\nAge: %d\nSex: %c\nBirthDate: %d/%d/%d\n",read_database[i].name,read_database[i].age,read_database[i].sex,read_database[i].day,read_database[i].month,read_database[i].year);
	}
getchar();

}
Header:
#include <stdio.h>
        struct person {
        char name[80];
        int age;
        char sex;
        int month;
        int day;
        int year;

        }
Database generate Source:
#include "/home/cordless/chomework/headerlib/dbstruct.h"

int main() {
  FILE *database;

  struct person person[10];

int i;

        for(i=0;i<=9;i++) {
                printf("Enter the persons Name: ");
                scanf("%s",person[i].name);
                printf("Enter the person's Age: ");
                scanf("%d",&(person[i].age));
                printf("Enter the person's Sex (M or F): ");
                getchar();
                scanf("%c",&(person[i].sex));
                printf("Enter the person's Birth Date (DD/MM/YYYY): ");
                scanf("%d/%d/%d",&(person[i].day),&(person[i].month),&(person[i].year));
 
        }
	
	database=fopen("mycensus.dat","wb");
        fwrite(person,sizeof(struct person),10,database);
        fclose(database);
return(0);	
}

Errors:
bash-3.00$ gcc -o readdata -Wall readdatabase.c
readdatabase.c: In function `main':
readdatabase.c:12: error: invalid application of `sizeof' to an incomplete type