Question

Using struct.c, as a starting point, implement an application that creates a database of employee personal records. Your implementation should follow these guidelines:

• the definition of the structure PERSON should be provided in an h-file called person.h that you need to create in the src sub-directory,
  • for the content, refer to the lecture notes,
• typdef should be used for referencing the PERSON structure,
• an array employees[] should be declared in the main C file (that is struct.c),
• a new C file person.c needs to be created; person.c should include implementations of the following functions:
  • addEmployee() to read the person data from the standard input and to add it to the array,
  • displayEmployee() to display the data for a single employee,
  • displayAllEmployees() to display data for all employees,
• the main program should read in the data for a number of employees by first prompting the user for the number of employees, allocating sufficient space for the employees in the array, and then calling the addEmployee() function to populate the current element of the array.

Here are the signatures of the functions that must be declared in person.h and defined in person.c:

void addEmployee(PERSON *employee);
void displayAllEmployees(PERSON employees[], int numberOfEmployees);
void displayEmployee(PERSON *employee);

#include <stdio.h>

struct birthday {
    int month;
    int day;
    int year;
};

"struct.c"
int main(void) {
    struct birthday myBday;    // - no ‘new’ needed !
                               // then, use dot notation like in Java ! */
    scanf("%d/%d/%d", &myBday.month, &myBday.day, &myBday.year);
    printf("I was born on %d/%d/%d\n", myBday.month, myBday.day, myBday.year);

    return 0;
}

"person.c"

#include "person.h"

#define INPUT_BUFFER_SIZE;

void addEmployee(PERSON *employees){

    printf("");
    scanf("%d", &employees->age);
}
void displayAllEmployee(PERSON employees[], int numberOfEmployees){

}
void displayEmployees(PERSON *employees){

}

"person.h"

#ifndef C_TUT_PERSON_H
#define C_TUT_PERSON_H

#include <stdio.h>

typedef struct {
    int month;
    int day;
    int year;
} DATE;

typedef struct {
    char name[41];
    int age;
    float height;
    DATE bday;
} PERSON;

void addEmployee(PERSON *employee);
void displayAllEmployees(PERSON employees[], int numberOfEmployees);
void displayEmployees(PERSON *employees);

Answer 1

Implemented and tested all three files. Output and comments added for better clarity.

----------------------------------------------------------person.h----------------------------------------------------------

#ifndef C_TUT_PERSON_H
#define C_TUT_PERSON_H

#include <stdio.h>

typedef struct {
int month;
int day;
int year;
} DATE;

typedef struct {
char name[41];
int age;
float height;
DATE bday;
} PERSON;

void addEmployee(PERSON *employee);
void displayAllEmployees(PERSON employees[], int numberOfEmployees);
void displayEmployees(PERSON *employees);

#endif

----------------------------------------------------------person.c----------------------------------------------------------

#include "person.h"
#include<stdio.h>
void addEmployee(PERSON *employee)
{
DATE mydate; //Date variable
printf("Enter Employee Name: "); //Accept Name
scanf("%s",employee->name);
printf("Enter Employee Age: "); //Accept Age
scanf("%d",&employee->age);
printf("Enter Date Of Birth: "); //Accept BDay
printf(" Enter Month: ");
scanf("%d",&mydate.month);
printf("Enter Day: ");
scanf("%d",&mydate.day);
printf("Enter Birthday Year: ");
scanf("%d",&mydate.year);

employee->bday = mydate;
}

void displayAllEmployees(PERSON employees[], int numberOfEmployees)
{
int i;
for(i=0;i<numberOfEmployees;i++) //Display all employees
{
printf(" Employee %d:",(i+1));
printf(" Name: %s",employees[i].name); //Name
printf(" Age: %d",employees[i].age); //Age
printf(" Birthday: %d-%d-%d",employees[i].bday.month,employees[i].bday.day,employees[i].bday.year); //B'Day
}
}

void displayEmployees(PERSON *employees) //Display single employee
{
printf(" Name: %s",employees->name);
printf(" Age: %d",employees->age);
printf(" Birthday: %d-%d-%d",employees->bday.month,employees->bday.day,employees->bday.year);
}

-----------------------------------------------------------struct.c-----------------------------------------------------------

#include "person.h"

int main(void)
{
int numberOfEmployees,i; //Initialize Variables
printf("Enter the number of Employees: "); //Accept no of employees
scanf("%d",&numberOfEmployees);

PERSON employees[numberOfEmployees];
for(i=0;i<numberOfEmployees;i++) //Accept all employees
{
printf(" Employee %d ",(i+1));
PERSON employee;
addEmployee(&employee); //Get employee details
employees[i] = employee; //Add employee to structure array
}

//Testing both the display functions
displayEmployees(&employees[0]); //Display the first employee
displayAllEmployees(employees,numberOfEmployees); //Display all employees
return 0;
}

Output:

Please comment if you have any queries or need clarification. Cheers!