Void function not showing up?

[codingnewbie12]

The one in question is the "outputfn()" it is likely something to do with what I am putting in the (), but no matter what I try it is not working. Whenever I compile the program, it shows everything put the output I want. *Keep in mind I am VERY new to programming so if this looks like a disaster please help!

 #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;}

(more code but wouldnt let me post it)

[Ganado]

There are some smart people here, but we aren't psychic (usually).

> but no matter what I try it is not working
What isn't working? What is the desired output, and what are you getting instead?

Don't just give us 100s of lines of code and expect us to sift through them, give the minimal amount of code you can such that it still reproduces the problem you have.

[48T7M4Gy]

@OP A couple of points/tips about your programming style:
1. A function does something so name it with an active and meaningful name indicating that. You don't have to put 'fn' after every name. We know it is a function. Instead of creditcardfn for example think up a better name which will give you a clear focus of what you are trying to achieve. APRfn is anybody's guess what that is supposed to do.

2. Most of your comments are unnecesary and should be deleted. You don't have to merely repeat what the code does (that's a bad practice that students get into at the start). Good comments are just a simple guide to what a small section of code is doing. Your program doesn't need more than about half a dozen explanatory comments on what's happening next.

3. Function prototypes (before main() ) don't conventionally have, nor require, variable names.

4. You need to properly indent your code.

5. Your outputfn() is very unlikely to require so many parameters to do its job. As a rough rule of thumb if you have more than 4 or 5 parameters tops then your function is probably wrong because it is being expected to do too much and should be broken down. Clairvoyance aside, given the case with your outputfn( parameters = 'War and Peace') I didn't bother reading it, it's too heavy.

6. Keep line width to a maximum of 80 characters.

Don't forget to answer @Ganado. :)