Thread: New to C++; not sure how to solve error regarding my code w/ functions

Hi all,

I'm taking an introduction to C++ right now and I've been scratching my head over these errors. I'm not sure why my function is not being defined?

The errors are: undefined reference to 'totalfare(char)' and [error] ID returned 1 exit status.

Not looking for straight up answers but any guidance would be most appreciated. Thanks!

Code:

#include <iostream>
#include <cstdlib>
using namespace std;


double totalfare(char code);
void output(double);




int main()
{
	string flname;
	int mins, miles;
	char code, surge;
	double surgem, totalcost;
	
	cout << "What is your first and last name?";
	cin >> flname;
	cout << "How long is your ride in minutes?";
	cin >> mins;
	cout << "How many miles is your ride?";
	cin >> miles;
	cout << "What is the code of the ride?";
	cin >> code;
	cout << "Is there a surge?";
	cin >> surge;
	if (surge == 'Y')
		{
			
			cout << "What is the surge multiplier?";
			cin >> surgem;
			exit(0);
		}


	totalcost = totalfare(code);
	output(totalcost);	
	return 0;
	
}


double totalfare(char code, char surge, double surgem, int mins, int miles)
{
	double totalcost;
	
	if (code == 'X')
	{
		if (surge == 'Y' && totalcost >= 6.55)
			{
				totalcost = (surgem * 2.00) + (mins * 0.22) + (miles * 1.15); 
				return totalcost;
			}	
		else	
			{
				totalcost = 6.55;
				return totalcost;
			}
	}
	
	else if (code == 'S')
	{
		if (surge == 'Y' && totalcost >= 25.00)
			{
				totalcost = (surgem * 15.00) + (mins * 0.90) + (miles * 3.75);
				return totalcost;
			}
		else
			{
				totalcost = 25.00;
				return totalcost;
			}
	}
	
	else if (code == 'L')	
	{
		if (surge == 'Y' && totalcost >= 10.55)
			{
				totalcost = (surgem * 5.00) + (mins * 0.50) + (miles * 2.75);
				return totalcost;	
			}
		else
			{
				totalcost = 10.55;
				return totalcost;
			}
	}
	
}


void output(double totalcost)
{
	cout << "Your total cost is: " << totalcost << endl;
	return;
}

Nevermind; I realized I didn't add my variables to the prototype in line 6 as well as the calculation in main in line 38.

A follow up questions; it doesn't seem to be calculating my totalcost correctly; it always defaults to the else statement for each character condition. Is this because I am comparing the variable totalcost before it is even calculated?

Thanks for the response -

I am trying make a condition where if the totalcost variable is less or more than the minimum total for each different case ('X', 'S', 'L').

So I assume I would have to check for the total cost after it has executed which means that if it is less than the minimum total, it would return minimum total; if it is more than the minimum total, it would return the actual calculated totalcost.

I am guessing that I would insert another "if/else" statement nested in after the initial totalcost is calculated? I will give this a try but I would appreciate input on my thought process here