Read world population data file. store the values in multipl, computer science, Basic Computer Science

Read World Population Data File. Store the
values in multiple vectors. Sort them by most
populated region and output the results

ext file is here : https://www.csupomona.edu/~hmzaidi/Winter2012/CS128/WorldPopulation2010.txt

please show me the code which is working perfectly.

please follow under this code

#include
#include
#include
#include
#include
#include
using namespace std;

int main()
{
// Define vectors to hold the data
vector countryNames;
vector countryCodes;
vector countryPopulations;

// Open the input file
string filename =
"C:\\Teaching\\CSUPomona\\CS128\\Winter2011\\WorldPopulation2010.txt";
ifstream in_file;
in_file.open(filename.c_str(), ios::in);

// Read the header
string header;
getline(in_file, header);

string line;
while (getline(in_file, line))
{
cout << line << endl;

string countryName;
string countryCode;
string countryPopulation;

// Parse the line to extract country name, code & population
for (int i = 0; i < line.length(); i++)
{
if (isdigit((unsigned char)line[i]))
{
countryName = line.substr(0, i);
countryCode = line.substr(i, 3);
countryPopulation = line.substr(i + 3, line.length() - i - 3);

countryNames.push_back(countryName);
countryCodes.push_back(atoi(countryCode.c_str()));
countryPopulations.push_back(atof(countryPopulation.c_str()));

break;
}
}
}

// Sort the vectors based on population
for (int i = 0; i < countryPopulations.size(); i++)
{
for (int j = i + 1; j < countryPopulations.size(); j++)
{
if (countryPopulations[j] < countryPopulations[i])
{
double tempP = countryPopulations[j];
countryPopulations[j] = countryPopulations[i];
countryPopulations[i] = tempP;

int tempC = countryCodes[j];
countryCodes[j] = countryCodes[i];
countryCodes[i] = tempC;

string tempN = countryNames[j];
countryNames[j] = countryNames[i];
countryNames[i] = tempN;
}
}
}

// Write the vectors to a file

string out_filename =
"C:\\Teaching\\CSUPomona\\CS128\\Winter2011\\WorldPopulation2010Sorted.txt";

ofstream out_file;
out_file.open(out_filename.c_str(), ios::out);

for (int i = 0; i < countryPopulations.size(); i++)
{
out_file << countryNames[i] << " "
<< countryCodes[i] << " " << countryPopulations[i] << endl;
}

char key;
cin >> key;

return 0;
}

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