Plurality Pset 2 CS50

plurality.c

#include <cs50.h>

#include <stdio.h>

#include <string.h>

#include <stdbool.h>

// Max number of candidates
#define MAX 9

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

// Array of candidates
candidate candidates[MAX];

// Number of candidates
int candidate_count;

// Function prototypes
bool vote(string name);
void print_winner(void);

int main(int argc, string 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 = get_int("Number of voters: ");

  // Loop over all voters
  for (int i = 0; i < voter_count; i++) {
    string name = get_string("Vote: ");

    // Check for invalid vote
    if (!vote(name)) {
      printf("Invalid vote.\n");
    }
  }
  // Display winner of election
  print_winner();
}

// Update vote totals given a new vote
bool vote(string name) {
  // TODO
  bool exist = false;

  for (int i = 0; i < candidate_count; i++) {
    //check if the typed in name is in the list of candidates
    if (strcmp(name, candidates[i].name) == 0) {
      candidates[i].votes += 1;
      exist = true;
      break;
    }
  }
  return exist;
}

// Print the winner (or winners) of the election
void print_winner(void) {
  int most = candidates[0].votes;
  string winner = candidates[0].name;
  for (int i = 1; i < candidate_count; i++) {
    if (most < candidates[i].votes) {
      most = candidates[i].votes;
    }

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