plurality.c

#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>
#include <cs50.h>

// Max number of candidates
#define MAX 9
int s = 0;
int max = 0;

// Candidates have name and vote count
typedef struct
{
    char *name;
    int votes;
}
candidate;

// Array of candidates
candidate candidates[MAX];

// Number of candidates
int candidate_count;

// Function prototypes
int vote(char* name);
void print_winner(void);

int main(int argc, char * argv[])
{
    // Check for invalid usage
    if (argc < 2)
    {
        printf("Usage: plurality [candidate ...]\n");
        return 1;
    }

    // Populate array of candidates
    candidate_count = argc - 1;
    if (candidate_count > MAX)
    {
        printf("Maximum number of candidates is %i\n", MAX);
        return 2;
    }
    for (int i = 0; i < candidate_count; i++)
    {
        candidates[i].name = argv[i + 1];
        candidates[i].votes = 0;
    }
    int voter_count;
    char name[30];
    printf("Number of voters: ");
    scanf("%d", &voter_count);

    // Loop over all voters
    for (int i = 0; i < voter_count; i++)
    {
        printf("Vote: ");
        scanf("%s", name);

        // Check for invalid vote
        if (vote(name) != 1)
        {
            printf("Invalid vote.\n");
        }
    }

    // Display winner of election
    print_winner();
    return 0;
}

// Update vote totals given a new vote
int vote(char * name)
{
    // TODO
    for(int i = 0; i <candidate_count; i++)
    {
        if(strcmp(candidates[i].name, name) ==0)
        {   candidates[i].votes++;
            return 1 ;
        }
    }

   return 0;

}

// Print the winner (or winners) of the election
void print_winner(void)
{

    for(int i = 0; i < candidate_count; i++ )
    {
        if(max <= candidates[i].votes)
          max = candidates[i].votes;
    }

    for(int i = 0; i < candidate_count; i++)
    {
        if (candidates[i].votes == max)
        printf("%s\n", candidates[i].name);
    }


}