voting_system.c

/*

    voting_system.c

    Task:

    https://scontent.fbeg7-1.fna.fbcdn.net/v/t1.15752-9/79090088_2557402667827007_2246587501504364544_n.png?_nc_cat=108&_nc_ohc=xZavIJ8pweYAQn3PHIaGRv8ABXRuOaKcynjHDGpEKfnjyw5JEMRdJ4RPw&_nc_ht=scontent.fbeg7-1.fna&oh=25240f9c364557059e776852ea1a58e4&oe=5E6D8BE6

    https://scontent.fbeg7-1.fna.fbcdn.net/v/t1.15752-9/79265770_727426401076495_1186445090151727104_n.jpg?_nc_cat=102&_nc_ohc=u5LhbMTsrI0AQmzd4xCRDWs-sRAjnfppZhWvfn6vJZUjcvn7VFDBbpB_w&_nc_ht=scontent.fbeg7-1.fna&oh=397d73147916bc2933a6a402c108385e&oe=5E72C34E



    You can find all my C programs at Dragan Milicev's pastebin:

    https://pastebin.com/u/dmilicev

*/

#include <stdio.h>
#include <conio.h>
#include <string.h>


// fill the bank of 10 users names and their passwords
void fill_users_names_and_passwords( char users_names_arr[10][20], char users_pass_arr[10][20] )
{
    int i;

    for( i=0; i<10; i++)
    {
        sprintf( users_names_arr[i], "User%d", i );
        sprintf( users_pass_arr[i],  "pass%d", i );
    }

/*  // or
    strcpy( users_names_arr[0], "User0" );
    strcpy( users_pass_arr[0],  "pass0" );

    strcpy( users_names_arr[1], "User1" );
    strcpy( users_pass_arr[1],  "pass1" );

    strcpy( users_names_arr[2], "User2" );
    strcpy( users_pass_arr[2],  "pass2" );

    strcpy( users_names_arr[3], "User3" );
    strcpy( users_pass_arr[3],  "pass3" );

    strcpy( users_names_arr[4], "User4" );
    strcpy( users_pass_arr[4],  "pass4" );

    strcpy( users_names_arr[5], "User5" );
    strcpy( users_pass_arr[5],  "pass5" );

    strcpy( users_names_arr[6], "User6" );
    strcpy( users_pass_arr[6],  "pass6" );

    strcpy( users_names_arr[7], "User7" );
    strcpy( users_pass_arr[7],  "pass7" );

    strcpy( users_names_arr[8], "User8" );
    strcpy( users_pass_arr[8],  "pass8" );

    strcpy( users_names_arr[9], "User9" );
    strcpy( users_pass_arr[9],  "pass9" );
*/
} // fill_users_names_and_passwords()


void fill_candidates_names_arr( char Mayor_name_arr[3][20],     int Mayor_vote_arr[3],
                                char V_Mayor_name_arr[3][20],   int V_Mayor_vote_arr[3],
                                char Secretary_name_arr[3][20], int Secretary_vote_arr[3],
                                char Treasurer_name_arr[3][20], int Treasurer_vote_arr[3] )
{
    int i;

    strcpy( Mayor_name_arr[0], "Maria" );
    strcpy( Mayor_name_arr[1], "Jose" );
    strcpy( Mayor_name_arr[2], "Xhi" );

    for( i=0; i<3; i++)         // reset votes
        Mayor_vote_arr[i] = 0;

    strcpy( V_Mayor_name_arr[0], "Estella" );
    strcpy( V_Mayor_name_arr[1], "Agnes" );
    strcpy( V_Mayor_name_arr[2], "Marley" );

    for( i=0; i<3; i++)         // reset votes
        V_Mayor_vote_arr[i] = 0;

    strcpy( Secretary_name_arr[0], "Janinen" );
    strcpy( Secretary_name_arr[1], "Ariel" );
    strcpy( Secretary_name_arr[2], "Gerard" );

    for( i=0; i<3; i++)         // reset votes
        Secretary_vote_arr[i] = 0;

    strcpy( Treasurer_name_arr[0], "Jenalyn" );
    strcpy( Treasurer_name_arr[1], "Rhea" );
    strcpy( Treasurer_name_arr[2], "Marife" );

    for( i=0; i<3; i++)         // reset votes
        Treasurer_vote_arr[i] = 0;

} // fill_candidates_names_arr()


void display_candidates_and_votes( char Mayor_name_arr[3][20],     int Mayor_vote_arr[3],
                                   char V_Mayor_name_arr[3][20],   int V_Mayor_vote_arr[3],
                                   char Secretary_name_arr[3][20], int Secretary_vote_arr[3],
                                   char Treasurer_name_arr[3][20], int Treasurer_vote_arr[3] )
{
    int i;

    printf("\n List of all candidates and their votes: \n");

    printf("\n Mayor \n");
    for(i=0;i<3;i++)
        printf("\n %d. %s \t %d ", i+1, Mayor_name_arr[i], Mayor_vote_arr[i] );

    printf("\n\n Vice - Mayor \n");
    for(i=0;i<3;i++)
        printf("\n %d. %s \t %d ", i+1, V_Mayor_name_arr[i], V_Mayor_vote_arr[i] );

    printf("\n\n Secretary \n");
    for(i=0;i<3;i++)
        printf("\n %d. %s \t %d ", i+1, Secretary_name_arr[i], Secretary_vote_arr[i] );

    printf("\n\n Treasurer \n");
    for(i=0;i<3;i++)
        printf("\n %d. %s \t %d ", i+1, Treasurer_name_arr[i], Treasurer_vote_arr[i] );


    printf("\n");

} // display_candidates_and_votes()


void display_candidates( char text[], char name_arr[3][20] )
{
    int i;

    printf("%s", text);

    for(i=0;i<3;i++)
        printf("\n %d. %s ", i+1, name_arr[i] );

    printf("\n");

} // display_candidates()


void display_all_candidates( char Mayor_name_arr[3][20],
                             char V_Mayor_name_arr[3][20],
                             char Secretary_name_arr[3][20],
                             char Treasurer_name_arr[3][20] )
{
    display_candidates("\n Mayor:\n", Mayor_name_arr );

    display_candidates("\n V_Mayor:\n", V_Mayor_name_arr );

    display_candidates("\n Secretary:\n", Secretary_name_arr );

    display_candidates("\n Treasurer:\n", Treasurer_name_arr );
} // display_all_candidates()


// return 1 if in bank exist user_name and user_pass, otherwise return 0
int exist_in_bank( char users_names_arr[10][20], char users_pass_arr[10][20],
                 char user_name[20], char user_pass[20] )
{
    int i, exist=0;

    for( i=0; i<10; i++)
    {
        if( strcmp(users_names_arr[i],user_name)==0 && strcmp(users_pass_arr[i],user_pass)==0 )
            exist = 1;              // 1 if user_name and user_pass exists in bank
    }

    return exist;

} // exist_in_bank()


// returns 1 on success, otherwise returns 0 (for more than 3 attempts)
int user_login( char user_name[20], char user_pass[20],
                char users_names_arr[10][20], char users_pass_arr[10][20] )
{
    int number_of_login_attempts = 0;
    int end = 0;

    while( !end && number_of_login_attempts<=2 )
    {
        number_of_login_attempts++;     // count user number_of_login_attempts

        // Enter user login name
        printf("\n\n Enter user login name: ");
        scanf( "%s", user_name );

        // Enter user login password
        printf("\n Enter user login password: ");
        scanf( "%s", user_pass );

        if( exist_in_bank(users_names_arr, users_pass_arr, user_name, user_pass) )
            end = 1;
        else
            printf("\n Wrong data. Try %d more times \n", 3 - number_of_login_attempts );
    }

    return end;

} // user_login()


// returns 0 if user voted for first candidate
// returns 1 if user voted for second candidate
// returns 2 if user voted for third candidate
int get_vote( void )
{
    int num = 0;

    while ( !num )
    {
        printf("\n Enter the number of candidate you are voting for :  ");
        scanf("%d", &num );

        if ( num < 1 || num > 3 )
        {
            printf("\n Vote must be 1, 2 or 3.  Try again ! \n");
            num = 0;
        }
    }

    return (num-1);

} // get_vote()


void vote( char Mayor_name_arr[3][20],     int Mayor_vote_arr[3],
           char V_Mayor_name_arr[3][20],   int V_Mayor_vote_arr[3],
           char Secretary_name_arr[3][20], int Secretary_vote_arr[3],
           char Treasurer_name_arr[3][20], int Treasurer_vote_arr[3] )
{
    display_candidates("\n Mayor candidates \n", Mayor_name_arr );  // display candidates
    Mayor_vote_arr[ get_vote() ]++;             // we are increasing the number of votes

    display_candidates("\n V_Mayor candidates \n", V_Mayor_name_arr );  // display candidates
    V_Mayor_vote_arr[ get_vote() ]++;           // we are increasing the number of votes

    display_candidates("\n Secretary candidates \n",  Secretary_name_arr ); // display candidates
    Secretary_vote_arr[ get_vote() ]++;         // we are increasing the number of votes

    display_candidates("\n Treasurer candidates \n",  Treasurer_name_arr ); // display candidates
    Treasurer_vote_arr[ get_vote() ]++;         // we are increasing the number of votes

} // vote()


// return -1 if no one is elected because of equal number of votes
// return  0 if first  candidate is elected
// return  1 if second candidate is elected
// return  2 if third  candidate is elected
int elected( char name_arr[3][20], int vote_arr[3] )
{
    int i, max, index, number_of_the_same_votes=0;

    max = vote_arr[0];          // suppose the first candidate has the highest number of votes
    index = 0;                  // we remember his index in array

    for( i=1; i<3; i++ )        // compare him to other two candidates
        if( max < vote_arr[i] )
        {
            max = vote_arr[i];  // then he has max votes
            index = i;          // we remember his index in array
        }

    for( i=0; i<3; i++ )        // count same votes
        if( max == vote_arr[i] )
            number_of_the_same_votes++;

    if( number_of_the_same_votes > 1 )
        return -1;              // no one is elected because of equal number of votes
    else
        return index;           // return array index of elected candidate

} // elected()


void display_result_of_voting( char Mayor_name_arr[3][20],     int Mayor_vote_arr[3],
                               char V_Mayor_name_arr[3][20],   int V_Mayor_vote_arr[3],
                               char Secretary_name_arr[3][20], int Secretary_vote_arr[3],
                               char Treasurer_name_arr[3][20], int Treasurer_vote_arr[3]  )
{
    int index;
    //char elected_candidate[20];

    printf("\n ______________________________________________________ \n\n");
    printf("\n \t\t\t List of Nominated Candidates \n\n");

    index = elected( Mayor_name_arr, Mayor_vote_arr );
    if ( index == -1 )
        printf("\n Mayor          :  %2d \t %s \n", index, "No one is elected because of same number of votes." );
    else
        printf("\n Mayor          :  %2d \t %s \n", Mayor_vote_arr[index], Mayor_name_arr[index] );

    index = elected( V_Mayor_name_arr, V_Mayor_vote_arr );
    if ( index == -1 )
        printf("\n Vice - Mayor   :  %2d \t %s \n", index, "No one is elected because of same number of votes." );
    else
        printf("\n Vice - Mayor   :  %2d \t %s \n", V_Mayor_vote_arr[index], V_Mayor_name_arr[index] );


    index = elected( Secretary_name_arr, Secretary_vote_arr );
    if ( index == -1 )
        printf("\n Secretary      :  %2d \t %s \n", index, "No one is elected because of same number of votes." );
    else
        printf("\n Secretary      :  %2d \t %s \n", Secretary_vote_arr[index], Secretary_name_arr[index] );


    index = elected( Treasurer_name_arr, Treasurer_vote_arr );
    if ( index == -1 )
        printf("\n Treasurer      :  %2d \t %s \n", index, "No one is elected because of same number of votes." );
    else
        printf("\n Treasurer      :  %2d \t %s \n", Treasurer_vote_arr[index], Treasurer_name_arr[index] );


    printf("\n\n Thank you for Voting !!! \n\n");

} // display_result_of_voting()



int main()
{
    char user_name[20];                 // name of user who will vote
    char user_pass[20];                 // pass of user who will vote

    char users_names_arr[10][20];       // bank of 10 users with their names long max 20 characters
    char users_pass_arr[10][20];        // bank of 10 passwords each long max 20 characters

    char Mayor_name_arr[3][20];         // 3 candidates names long max 20 characters
    char V_Mayor_name_arr[3][20];
    char Secretary_name_arr[3][20];
    char Treasurer_name_arr[3][20];

    int Mayor_vote_arr[3];              // 3 candidates and their int number of votes
    int V_Mayor_vote_arr[3];
    int Secretary_vote_arr[3];
    int Treasurer_vote_arr[3];

    int number_of_login_attempts = 0;
    int end = 0;                        // flag 0-1
    int i;
    char ch;                            // char for answer (Y / N)


    // initialize user names and passwords for 10 users
    fill_users_names_and_passwords( users_names_arr, users_pass_arr );

    // display users names and their passwords
    // (put in comment if you don't want to display this)
    for(i=0;i<10;i++)
        printf("\n users_names_arr[%d] = %s \t users_pass_arr[%d] = %s \n",
                i, users_names_arr[i], i, users_pass_arr[i] );

    // Initialize all candidates
    fill_candidates_names_arr( Mayor_name_arr,     Mayor_vote_arr,
                               V_Mayor_name_arr,   V_Mayor_vote_arr,
                               Secretary_name_arr, Secretary_vote_arr,
                               Treasurer_name_arr, Treasurer_vote_arr );
    while( !end )
    {
        if( user_login(user_name, user_pass, users_names_arr, users_pass_arr ) == 1 )
        {
            printf("\n ______________________________________________________ \n\n");
            printf("\n Welcome %s to Voting System: \n", user_name );

            vote( Mayor_name_arr,     Mayor_vote_arr,
                  V_Mayor_name_arr,   V_Mayor_vote_arr,
                  Secretary_name_arr, Secretary_vote_arr,
                  Treasurer_name_arr, Treasurer_vote_arr );

            printf("\n Next user (Y or N) :  ");

            ch = _getch();

            if ( ch=='n' || ch=='N' )
                end = 1;
        }
        else
        {
            printf("\n Voting is interrupted by a total of three failed logins ! \n");
            end = 1;
        }
    }

    // display result of voting
    display_result_of_voting( Mayor_name_arr,     Mayor_vote_arr,
                              V_Mayor_name_arr,   V_Mayor_vote_arr,
                              Secretary_name_arr, Secretary_vote_arr,
                              Treasurer_name_arr, Treasurer_vote_arr  );

    // display all candidates names and their votes
    // (put in comment if you don't want to display this)
    display_candidates_and_votes( Mayor_name_arr,     Mayor_vote_arr,
                                  V_Mayor_name_arr,   V_Mayor_vote_arr,
                                  Secretary_name_arr, Secretary_vote_arr,
                                  Treasurer_name_arr, Treasurer_vote_arr  );

    return 0;

} // main()