1) Define a global variable Emps that is an array of pointers to employee structs. 2) Change your createEmployee function to add the new employee to the Emps array. It should place it in the first slot that contains a NULL. 3) Write a listEmployees function that will call your display function on each employee in the array.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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This is the C code I have so far 





#include <stdio.h>

#include <stdlib.h>

struct employees

{

    char name[20];

    int ssn[9];

    int yearBorn, salary;

};

 

// function to read the employee data from the user

void readEmployee(struct employees *emp)

{

    printf("Enter name: ");

    gets(emp->name);

    printf("Enter ssn: ");

    for (int i = 0; i < 9; i++)

        scanf("%d", &emp->ssn[i]);

    printf("Enter birth year: ");

    scanf("%d", &emp->yearBorn);

    printf("Enter salary: ");

    scanf("%d", &emp->salary);

}

 

// function to create a pointer of employee type

struct employees *createEmployee()

{

    // creating the pointer

    struct employees *emp = malloc(sizeof(struct employees));

    // function to read the data

    readEmployee(emp);

    // returning the data

    return emp;

}

 

// function to print the employee data to console

void display(struct employees *e)

{

    printf("%s", e->name);

    printf("  %d%d%d-%d%d-%d%d%d%d", e->ssn[0], e->ssn[1], e->ssn[2], e->ssn[3], e->ssn[4], e->ssn[5], e->ssn[6], e->ssn[7], e->ssn[8]);

    printf("  %d", e->yearBorn);

    printf("\n$%d.", e->salary);

}

 

// function to free the memory of the employee pointer

void releaseEmployee(struct employees *e)

{

    free(e);

}

 

// main method

int main()

{

    // creating the employee

    struct employees *emp = createEmployee();

    // printing the information

    display(emp);

    // free the memory

    releaseEmployee(emp);

    return 0;

}

 

1) Define a global variable Emps that is an array of pointers to employee structs.
2) Change your createEmployee function to add the new employee to the Emps array. It should place it in the first slot that contains a NULL.
3) Write a listEmployees function that will call your display function on each employee in the array.
4) Change main to have a loop that looks for user commands.
• If the user types HIRE, you should call createEmployee.
If the user types LIST, you should call listEmployees.
• If the user types QUIT, you should exit the loop, which will then cause the program to exit.
5) Write a findEmployee function that takes a string parameter and returns the employee pointer with that name or NULL if no such person exists.
Change main to add a FIND name command that will find and display a single employee.
Transcribed Image Text:1) Define a global variable Emps that is an array of pointers to employee structs. 2) Change your createEmployee function to add the new employee to the Emps array. It should place it in the first slot that contains a NULL. 3) Write a listEmployees function that will call your display function on each employee in the array. 4) Change main to have a loop that looks for user commands. • If the user types HIRE, you should call createEmployee. If the user types LIST, you should call listEmployees. • If the user types QUIT, you should exit the loop, which will then cause the program to exit. 5) Write a findEmployee function that takes a string parameter and returns the employee pointer with that name or NULL if no such person exists. Change main to add a FIND name command that will find and display a single employee.
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