Функция Void не отображается?

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Тот, о котором идет речь, - это "outputfn ()", скорее всего, что-то связанное с тем, что я вкладываю в (), но независимо от того, что я пытаюсь, это не работает. Всякий раз, когда я компилирую программу, она показывает все, что я хочу вывести. *Имейте в виду, что я очень новичок в программировании, так что если это выглядит как катастрофа, пожалуйста, помогите!

#include<iostream>
#include<conio.h>
#include<fstream>
#include<iomanip>
using namespace std;
void displayFirstAndLast(const std::string& firstName, const std::string& lastName);
void headerfn();
string creditcardfn();
void verifycard();
void info();
void averageDailyBalancefn(double);
double APRfn();
void interestfn();
void outputfn(string firstName,string lastName,double interest,double APR,double averageDailyBalancefn,double netBalance,double payment,double d1,double d2,string cc,string verify
);


int main(){

headerfn();

string firstName;
string lastName;

cout << "Please enter your first and last name " <<endl;
cin >> firstName >> lastName;
displayFirstAndLast(firstName, lastName);//end input for name

string cc;
creditcardfn();//input for cc

string verify;
verifycard();
info();
APRfn();




double APRfn,averageDailyBalancefn,interest,netBalance, payment, d1, d2;cc;

outputfn(firstName,lastName,interest,APRfn,averageDailyBalancefn,netBalance,payment,d1,d2, cc, verify
);


//calculates inputs for netBalance, d1, payment, d2, and d1 again for
//what averageDailyBalance is



//this is where output will go for text file and below is rules?


cout<<"press any key to continue\n";
getch();
return 0;
}


//******************************************************************************
void headerfn(){

//void function without parameters
cout<<"=***************************************="<<endl;
cout<< "*  Date: April 11th 2017                *"<<endl;
cout<< "*  Credit Card Interest Calculator      *"<<endl;
cout<<"=***************************************="<<endl;
cout << "\n";
//adds space to program output
cout<< "This Program calculates the interest on unpaid"<<endl;
cout<< "credit card balances using the average daily balance"<<endl;
//outputs information for program user to know what program does
cout<< "\n";
cout<<endl<<endl;
//adds space to program output
}//end of headerfn
//******************************************************************************
void displayFirstAndLast(const std::string& firstName, const std::string& lastName){
std::cout << "You are " << firstName << " " << lastName << std::endl;}

//******************************************************************************
string creditcardfn(){//value returning function
string cc;
cout << "Please enter the credit card number: ";
cin >> cc;
//prompts user to enter credit card number and inputs their entry
cout << "\n";
//adds space to program output
cout << "You entered " <<cc <<endl;
//outputs what user entered for credit card number
cout << "\n";
//adds space to program output
return cc;
}

//where to read credit card with value returning function
//******************************************************************************
void verifycard(){ string verify;
cout << "If this is correct, press 0 or 1 to try again: ";
cin >> verify;
//prompts user to press 0 or 1 if credit card number is correct
while (verify !="0"){
//prompts program to output the following if input not zero
cout<< "\n";
//outputs a space
cout << "Please enter the credit card number: ";
//prompts user to enter their credit card number
cin >>verify;
//inputs what user put in for credit card number
cout<< "\n";
//outputs a space
cout <<"You entered " <<verify;
//outputs what user put in for credit card number
cout << "\n";
cout << "\n";
//outputs a space
//outputs a space
cout << "If this is correct, press 0 or 1 to try again: ";
//prompts user to press 0 if credit card number is correct, 1 to try again
cin >> verify;
//inputs what user types in for if correct
cout << "\n";
//outputs a space
//adds space to program output
}//end of while
cout << "\n";
//outputs a space

}

//use void function to verify card
//******************************************************************************
//Read the balance shown in bill (netBalance), payment made (payment), days in billing cycle (d1), and number days
//payment made before billing cycle (d2) using a void function
void info(){double netBalance, payment, d1,d2;
cout<< "Please enter balance on credit card bill ";
//prompts user to enter balance on credit card bill
cin >> netBalance;
//inputs netBalance, what user entered.
cout << "\n";
//adds space to program output
cout << "You entered $" <<netBalance <<endl;
//outputs netBalance that user input
cout << "\n";
//adds space to program output
cout << "Please enter the payment you made: ";
//prompts user to enter payment made
cin >> payment;
//inputs payment user enters
cout << "\n";
//adds space to program output
cout << "You entered $" <<payment <<endl;
//outputs payment user enters
cout << "\n";
//adds space to program output
cout  << "Please enter the number of days in the billing cycle: ";
//prompts user to enter number of days in billing cycle
cin >> d1;
//inputs what user types for d1
cout << "\n";
//adds space to program output
cout << "You entered " <<d1 <<endl;
//outputs what user types for d1
cout << "\n"; //adds space to program output
cout << "Please enter the number of days payment was made before billing cycle: ";
//prompts user to enter number of days payment was made before billing
cin >> d2;
//inputs what user types for d2
cout << "\n"; //adds space to program output
cout << "You entered " <<d2 <<endl;
//outputs what user types for d2
cout << "\n"; //adds space to program output

}

//******************************************************************************
//???????????
void averageDailyBalancefn(double averageDailyBalancefn,double netBalance,double d1,double d2,double payment){

averageDailyBalancefn = (netBalance * d1 - payment * d2)/d1;
}


//average daily balance void
//******************************************************************************
double APRfn(){double averageDailyBalancefn,APR;
if (averageDailyBalancefn<100.00) {
APR=5;}
// Executes when the average daily balance is less
//than 100.00

else if (averageDailyBalancefn<1000.00) {
APR=10;}
// Executes when the average daily balance is less
//than 1000.000
else (averageDailyBalancefn>1000.00); {
APR=15;}

}
// Executes when the average daily balance is greater
//than 1000.000

//APR value returning
//******************************************************************************

void interestfn(double averageDailyBalancefn,double APR,double interest){
interest= averageDailyBalancefn*APR/(100*12);
//finds interest in relation to averagedailybalance
//and APR divided by 100 times 12

};


//interest using void
//******************************************************************************
void outputfn(string firstName,string lastName,double interest,double APR,double averageDailyBalancefn,double netBalance,double payment,double d1,double d2,string cc,string verify
){
cout<<"**************************************************"<<endl;
cout<<"12345678901234567890123456789012345678901234567890"<<endl;
cout<<"**************************************************"<<endl;
cout<<"\n";
//adds space to program output
cout<<firstName<<' '<<' '<<' '<<' '<<' '<<' '<<' '<<' '<<lastName<<' '<<' '<<' '<<' '<<' '<<' '<<' '<<' '<<' '<<' '<<' '<<' '<<' '<<cc<<endl;
cout<<"--------------------------------------------------"<<endl;
cout<<"FIRST NAME   LAST NAME        CARD NUMBER"<<endl;
cout<<"=================================================="<<endl;
;cout << "\n"; //adds space to program output
cout<<"Credit Card Balance......................  "<<setprecision(2)<<fixed<<netBalance<<endl;
//outputs credit card balance in correct format
cout << "\n"; //adds space to program output
cout<<"Annual Interest Rate.....................  "<<setprecision(2)<<fixed<<' '<<' '<<APR<<endl;
//outputs annual interest rate in correct format
cout << "\n"; //adds space to program output
cout<< "Payment made.............................  "<<setprecision(2)<<fixed<<' '<<' '<<payment<<endl;
//outputs payment made in correct format
cout << "\n"; //adds space to program output
cout<<  "Number of days in Billing Cycle..........  "<<setprecision(2)<<fixed<<' '<<' '<<' '<<' '<<' '<<d1<<endl;
//outputs number of days in billing cycle in correct format
cout << "\n"; //adds space to program output
cout << "Number of Days Before Billing Cycle......  "<<setprecision(2)<<fixed<<' '<<' '<<' '<<' '<<' '<<' '<<d2<<endl;
//outputs number of days before billing cycle in correct format
cout << "\n"; //adds space to program output
cout << "Average daily balance....................  "<<setprecision(2)<<fixed<<averageDailyBalancefn<<'\n';
//outputs average daily balance in correct format
cout << "\n"; //adds space to program output
cout << "Interest on unpaid balance...............  " <<setprecision(2)<<fixed<<' '<<' '<<interest<<'\n';
//outputs interest on unpaid balance in correct format
cout << "\n"; //adds space to program output
cout<< "**************************************************" <<endl;
cout<<"\n";

cout<< "Please enter 0 to exit or 1 for another customer: ";
cin >> verify;
}
//adds space to program output
//the following repeats the program using a while statement



//output all using void

Что я уже пробовал:

Я пробовал изменить то, что находится в (), но я не уверен, что туда положить. Иногда он просто выдает мне ошибки, а иногда просто не появляется, когда я компилирую и запускаю.

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