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checkin.c
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checkin.c
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#include <stdio.h>
#include <cs50.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
typedef struct PARTICIPANT
{
string name;
bool checked_in;
struct PARTICIPANT * next;
}
PARTICIPANT;
PARTICIPANT * root = NULL;
#define CHECKED_IN true
#define CHECKED_OUT false
#define SIZE_OF_PARTICIPANT sizeof(PARTICIPANT)
string get_user_input();
bool perform(string user_input);
void add_one(string participant_name);
void remove_one(string participant_name);
void switch_one(string participant_name);;
void display_participants();
void free_memory();
// My functions
bool check_Input_If_Invalid(string input);
void add_To_The_Last_Participant(PARTICIPANT * new_Participant);
void display_Participant(PARTICIPANT * participant);
PARTICIPANT * free_All(PARTICIPANT * participant);
int main(void)
{
bool working = true;
while(working)
{
string user_input = get_user_input();
working = perform(user_input);
}
free_memory();
}
string get_user_input()
{
return get_string("Command: ");
}
// Performs the action from the "user_input"
bool perform(string user_input)
{
if(check_Input_If_Invalid(user_input) || strcmp(user_input, "") == 0)
{
printf("Unknown command!\nType help for available commands\n");
return true;
}
// Read the string of user input into two variables
string action_name = strtok(user_input, " ");
string participant_name = strtok(NULL, " ");
if(strcmp(action_name, "help") == 0)
{
printf("Available commands:\nadd -name-\nremove -name-\nswitch -name-\ndisplay -name-\nexit\n");
return true;
}
if(strcmp(action_name, "add") == 0)
{
add_one(participant_name);
return true;
}
if(strcmp(action_name, "remove") == 0)
{
remove_one(participant_name);
return true;
}
if(strcmp(action_name, "switch") == 0)
{
switch_one(participant_name);
return true;
}
if(strcmp(action_name, "display") == 0)
{
display_participants();
return true;
}
if(strcmp(action_name, "exit") == 0)
{
return false;
}
printf("Unknown command!\nType help for available commands\n");
return true;
}
bool check_Input_If_Invalid(string input)
{
for (int i = 0, j = strlen(input); i < j; i++)
{
if (input[i] == ' ')
{
if (i + 1 < j && !isalpha(input[i + 1]))
{
return true;
}
}
}
return false;
}
/*
Adds a participant to the beginning of the list
*/
void add_one(string participant_name)
{
printf("add %s\n", participant_name);
PARTICIPANT * new_Participant = malloc(SIZE_OF_PARTICIPANT);
new_Participant->name = participant_name;
new_Participant->checked_in = CHECKED_OUT;
new_Participant->next = NULL;
if (root == NULL)
{
root = malloc(SIZE_OF_PARTICIPANT);
root->name = NULL;
root->checked_in = NULL;
root->next = new_Participant;
}
else
{
add_To_The_Last_Participant(new_Participant);
}
}
void add_To_The_Last_Participant(PARTICIPANT * new_Participant)
{
PARTICIPANT * ptr = root;
while (ptr->next != NULL)
{
if (strcmp(ptr->next->name, new_Participant->name) == 0)
{
printf("Name already exists!\n");
return;
}
ptr = ptr->next;
}
ptr->next = new_Participant;
}
/*
Search for a participant in the list and if it exists, remove it.
*/
void remove_one(string participant_name)
{
printf("remove %s\n", participant_name);
PARTICIPANT * previos_Participant = root;
while (previos_Participant->next != NULL && strcmp(previos_Participant->next->name, participant_name))
{
previos_Participant = previos_Participant->next;
}
if (previos_Participant->next == NULL)
{
printf("Name doesn't exist!\n");
return;
}
PARTICIPANT * next_Participant = previos_Participant->next->next;
free(previos_Participant->next);
previos_Participant->next = NULL;
previos_Participant->next = next_Participant;
}
/*
Check a participant from the list in or out
*/
void switch_one(string participant_name)
{
printf("switching %s\n", participant_name);
PARTICIPANT * ptr = root;
while (ptr->next != NULL)
{
if (strcmp(ptr->next->name, participant_name) == 0)
{
if(ptr->next->checked_in)
{
ptr->next->checked_in = CHECKED_OUT;
}
else
{
ptr->next->checked_in = CHECKED_IN;
}
return;
}
ptr = ptr->next;
}
printf("Name not found!\n");
}
/*
Display all participants and their status.
*/
void display_participants()
{
printf("display\n");
display_Participant(root->next);
}
void display_Participant(PARTICIPANT * participant)
{
printf("Name: %s\nChecked in? %s\n", participant->name, participant->checked_in ? "true" : "false");
if (participant->next != NULL)
{
display_Participant(participant->next);
}
}
/*
Free all memory used by participants in the list
*/
void free_memory()
{
printf("freeing stuff.\n");
root = free_All(root);
}
PARTICIPANT * free_All(PARTICIPANT * participant)
{
if (participant != NULL)
{
if(participant->next != NULL)
{
participant->next = free_All(participant->next);
}
free(participant);
}
return NULL;
}