i just finish to program my plurality cs50 program. it runs smooth but when i run a check it says that it doesn't print the winner's name but it does. here it's the code, can anybody help me? as i said the function print_winner()
works, if i run debug50
I can see that. with a command-line argument i'm suppose to declare no more then 9 candidate, chosse how many vote i want, vote for the candidate and then the program is suppose to declare the winner(s). the problem is that it does it, but according with bot50 it doesn't.
#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++;
return true;
}
}
return false;
}
// Print the winner (or winners) of the election
void print_winner(void)
{
int n = candidate_count;
typedef struct
{
string name;
int votes;
}
bubble;
bubble bubbles[n];
for (int i = 0; i < n; i++)
{
for (int j = i + 1; j < n; j++)
{ //doing a bubble sort to move the max vote at the end and doing
the same with the candidate name
if (candidates[i].votes > candidates[j].votes)
{
bubbles[0].votes = candidates[i].votes;
candidates[i].votes = candidates[j].votes;
candidates[j].votes = bubbles[0].votes;
bubbles[0].name = candidates[i].name;
candidates[i].name = candidates[j].name;
candidates[j].name = bubbles[0].name;
}
}
}
for (int i = 1; i <= n; i++)
{
if (candidates[n - i].votes == candidates[n - 1].votes)
{
printf("%s ", candidates[n - i].name);
}
printf("\n");
}
}
It would be nice to see more of your code, like where candidates
and candidate_count
are defined/initialized, and for instance, if you're doing #include <string>
which indicates you're actually using
std::string
and not some other version of a string.
If that's the case, your use of std::string
is odd. Typically strcmp()
requires a pointer to a C-style array of chars or the type const char*
... as does printf()
... so you should append .c_str()
to your usages of name
and candidates[n - i].name
.
Ie strcmp(candidates[i].name.c_str(), name.c_str())
and printf("%s ", candidates[n - i].name.c_str());
Again, though, that's assuming you're actually using std::string
.
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