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June 9, 2020 12:42
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Harvard CS50 Plurality
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#include <cs50.h> | |
#include <stdio.h> | |
#include <string.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) | |
{ | |
for (int i = 0; i < candidate_count; i++) | |
{ | |
if (strcmp(candidates[i].name, name) == 0) | |
{ | |
candidates[i].votes += 1; | |
return true; | |
} | |
} | |
return false; | |
} | |
// Print the winner (or winners) of the election | |
void print_winner(void) | |
{ | |
// find the most votes count | |
int max_votes = 0; | |
for (int i = 0; i < candidate_count; i++) | |
{ | |
max_votes = (candidates[i].votes > max_votes) ? candidates[i].votes : max_votes; | |
} | |
// get the candidates with the max_votes (handle tie) | |
for (int i = 0; i < candidate_count; i++) | |
{ | |
if (candidates[i].votes == max_votes) | |
{ | |
printf("%s\n", candidates[i].name); | |
} | |
} | |
return; | |
} |
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