I need help finish this c++ program that computes and outputs the average househ

Question

I need help finish this c++ program that computes and outputs the average household income for  
each city to an output file. Down here is the incomplete code:

#include <iostream>
#include <iomanip>

using namespace std;
  
void initialize( // fill in the parameters );
void totalIncome( // fill in the parameters );
void averageIncome( // fill in the parameters );
void displayResults( // fill in the parameters );
double larger ( // fill in the parameters );

int main()
{
int countLV, countHD;
double totalLV, totalHD;
double averageLV, averageHD;
double topIncome;

cout << fixed << showpoint;   
cout << setprecision(2);
  
initialize( // fill in the parameters );

totalIncome( // fill in the parameters );

averageIncome( // fill in the parameters );

displayResults( // fill in the parameters ) ;

return 0;
}

void initialize( // fill in the parameters )
{

// This function initializes variables.
//
// Supply the code.

}

void totalIncome ( // fill in the parameters )
{

//This function reads data from a file and finds the sum of household income for each city.
// It also finds the highest household income.
// This function calls the "larger" function.
//
// Supply the code.

}

double larger ( // fill in the parameters )
{

// This function returns larger number from given 2 numbers.
//
// Supply the code.

}

void averageIncome( // fill in the parameters )
{

// This function finds the average income for each city.
//
// Supply the code.

}

void displayResults(// fill in the parameters )
{   

// This function outputs the relevant results.
//
// Supply the code.

}

Explanation / Answer

#include <iostream>
#include <iomanip>
#include <sstream>
#include <string>

using namespace std;

//To initialize all variables to be zero
void initialize(int *,int *,double *,double *,double *,double *,double *);

//To count number of households and to get the total income of each city
void totalIncome(int *,int *,double *,double *,double *);

//To get the average income of each city given the total income and number of households
void averageIncome(int,int,double,double,double *,double * );

//To display the results in required format
void displayResults(int,int,double,double,double,double,double);

//To get the larger of two given numbers, used to find highest income
double larger (double,double);

int main()
{
int countLV, countHD;
double totalLV, totalHD;
double averageLV, averageHD;
double topIncome;

cout << fixed << showpoint;   
cout << setprecision(2);
  
initialize( &countLV,&countHD,&totalHD,&totalLV,&averageHD,&averageLV,&topIncome);

totalIncome(&countLV,&countHD,&totalHD,&totalLV,&topIncome);

averageIncome(countLV,countHD,totalHD,totalLV,&averageHD,&averageLV );

displayResults( countLV,countHD,totalHD,totalLV,averageHD,averageLV,topIncome );

return 0;
}

void initialize( int *countLV,int *countHD,double *totalHD,double *totalLV,double *averageHD,double *averageLV,double *topIncome)
{
   *countLV = 0;
   *countHD = 0;
   *totalLV = 0.0;
   *totalHD = 0.0;
   *averageLV = 0.0;
   *averageHD = 0.0;
   *topIncome = 0.0;
  
}

void totalIncome (int *countLV,int *countHD,double *totalHD,double *totalLV,double *topIncome)
{
   string line,city,income;
   cout << "Processing Household Income" << endl;
   while(getline(cin,line)){
       istringstream iss(line);
       iss >> city;
       iss >> income;
       if(city == "HD"){
           *countHD += 1;
           double inc = stod(income);
           *totalHD += inc;
           *topIncome = larger(*topIncome,inc);
           cout << line << endl;
       }
       else if(city == "LV"){
           *countLV += 1;
           double inc = stod(income);
           *totalLV += inc;
           *topIncome = larger(*topIncome,inc);
           cout << line << endl;
       }  
       else{
           cout << "Bad Data" << endl;
       }
   }
}

double larger ( double a, double b)
{
   if (a >= b)
       return a;
   else
       return b;
}

void averageIncome( int countLV,int countHD,double totalHD,double totalLV,double *averageHD,double *averageLV)
{
   if(countLV != 0)
       *averageLV = (totalLV)/(countLV);
   if(countHD != 0)
       *averageHD = (totalHD)/(countHD);
}

void displayResults(int countLV,int countHD,double totalHD,double totalLV,double averageHD,double averageLV,double topIncome)
{
   cout << endl;
   cout << "***********************************" << endl;
   cout << " Trung Nguyen Assignment 8 " << endl;
   cout << "***********************************" << endl;
   cout << endl;
   cout << " Henderson " << endl;
   cout << "Number of households: " << countHD << endl;
   cout << "Total Household Income: $" << totalHD << endl;
   cout << "Average Household Income: $" << averageHD << endl;
   cout << "***********************************" << endl;
   cout << endl;
   cout << " Las Vegas " << endl;
   cout << "Number of households: " << countLV << endl;
   cout << "Total Household Income: $" << totalLV << endl;
   cout << "Average Household Income: $" << averageLV << endl;
   cout << "***********************************" << endl;
   cout << endl;

   cout << "Top Household Income: $" << topIncome << endl;
   cout << "***********************************" << endl;
}

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