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米ハーバード大学 CS50:課題「大統領選挙の集計プログラム」の回答例(Harvard CS50 Week 3: Problem Set 3 − Plurality)
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米ハーバード大学 CS50:課題「大統領選挙の集計プログラム」の回答例(Harvard CS50 Week 3: Problem Set 3 − Plurality) 

  

Plurality: 課題

選挙の集計プログラムを作る。ユーザーに候補者と投票数を入力させ、順に票が入った候補者の名前を入力していく。配列を使って集計をし、結果として最大投票数を集めた人を返すというプログラム。

https://cs50.harvard.edu/x/2021/psets/3/plurality/#plurality

 

Plurality: 回答例

#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)
{
    // Check name matches a candidate name
    for (int i = 0; i < candidate_count; i++)
    {
        if (strcmp(candidates[i].name, name) == 0)
        {
            candidates[i].votes++;
            return true;
        }
    }

    return false;
}

// Print the winner (or winners) of the election
void print_winner(void)
{
    // Get max votes
    int max_votes = 0;
    for (int i = 0; i < candidate_count; i++)
    {
        if (candidates[i].votes > max_votes)
        {
            max_votes = candidates[i].votes;
        }
    }

    // Print winner
    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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