# 05/22
https://hackmd.io/@-JG915ddTbSXM0tfs4kLTw/ryAJ5yABn

# 主程式

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include"myheader.h"

#define MAX_NAME_LENGTH 80
#define NUM_PERSONS 10

Person Group[NUM_PERSONS];

void showMenu()
{
    printf("Choose a function, enter 0 to finish:\n");
    printf("1) Show list of positions to be hired\n");
    printf("2) Show list of already hired positions (Sort by number)\n");
    printf("3) Show list of already hired positions (Sort by name)\n");
    printf("4) Hire a person\n");
    printf("5) Fire a person\n");
}

int main()
{
    for (int i = 0; i < NUM_PERSONS; i++) {
        Group[i].id = i + 1;
        Group[i].hired = 0;
        strcpy(Group[i].name, "");
    }

    int choice;
    do {
        showMenu();
        scanf("%d", &choice);

        switch (choice) {
        case 0:
            printf("Exiting...\n");
            break;
        case 1:
            showPositionsToBeHired(Group);
            break;
        case 2:
            showAlreadyHiredPositionsByNumber(Group);
            break;
        case 3:
            showAlreadyHiredPositionsByName(Group);
            break;
        case 4:
            hirePerson(Group);
            break;
        case 5:
            firePerson(Group);
            break;
        default:
            printf("Invalid choice. Please try again.\n\n");
            break;
        }
    } while (choice != 0);

    return 0;
}

# 宣告檔頭

#ifndef MYHEADER_H_INCLUDED
#define MYHEADER_H_INCLUDED
#define MAX_NAME_LENGTH 80
#define NUM_PERSONS 10

typedef struct {
    int id;
    int hired;
    char name[MAX_NAME_LENGTH];
} Person;

void showPositionsToBeHired(Person group[]);
void showAlreadyHiredPositionsByNumber(Person group[]);
void showAlreadyHiredPositionsByName(Person group[]);
void hirePerson(Person group[]);
void firePerson(Person group[]);

#endif // MYHEADER_H_INCLUDED
_H_INCLUDED

# 把showPositionsToBeHired移到一個新檔案

#include <stdio.h>
#include"myheader.h"

void showPositionsToBeHired(Person group[])
{
    printf("Positions to be hired:\n");
    for (int i = 0; i < NUM_PERSONS; i++) {
        if (!group[i].hired) {
            printf("%d\n", group[i].id);
        }
    }
    printf("\n");
}

# 把showAlreadyHiredPositionsByNumber移到一個新檔案

#include <stdio.h>
#include"myheader.h"

void showAlreadyHiredPositionsByNumber(Person group[])
{
    printf("Already hired positions (Sorted by number):\n");
    for (int i = 0; i < NUM_PERSONS; i++) {
        if (group[i].hired) {
            printf("%d\n", group[i].id);
        }
    }
    printf("\n");
}

# 把showAlreadyHiredPositionsByName移到一個新檔案

#include <stdio.h>
#include"myheader.h"

void showAlreadyHiredPositionsByName(Person group[])
{
    printf("Already hired positions (Sorted by name):\n");
    for (int i = 0; i < NUM_PERSONS; i++) {
        if (group[i].hired) {
            printf("%s\n", group[i].name);
        }
    }
    printf("\n");
}

# 把hirePerson移到一個新檔案

#include <stdio.h>
#include"myheader.h"

void hirePerson(Person group[])
{
    int position;
    char name[MAX_NAME_LENGTH];

    printf("Enter the position number to hire: ");
    scanf("%d", &position);

    if (position < 1 || position > NUM_PERSONS) {
        printf("Invalid position number.\n\n");
        return;
    }

    if (group[position - 1].hired) {
        printf("Position is already hired.\n\n");
        return;
    }

    printf("Enter the name of the person to hire: ");
    scanf("%s", name);

    group[position - 1].id = position;
    group[position - 1].hired = 1;
    strcpy(group[position - 1].name, name);

    printf("Person hired successfully.\n\n");
}

# 把firePerson移到一個新檔案

#include <stdio.h>
#include"myheader.h"

void firePerson(Person group[])
{
    int position;

    printf("Enter the position number to fire: ");
    scanf("%d", &position);

    if (position < 1 || position > NUM_PERSONS) {
        printf("Invalid position number.\n\n");
        return;
    }

    if (!group[position - 1].hired) {
        printf("Position is not hired.\n\n");
        return;
    }

    group[position - 1].hired = 0;
    strcpy(group[position - 1].name, "");

    printf("Person fired successfully.\n\n");
}