Compiling Error, cannot figure out

Hey people, this error is probably really easy for you, but i dont know whats up. Here is where my errors are i think:

----------------------Start-----
compute_costs ( id_number, room_length, room_width, flooring_unit_cost,
flooring_pad_unit_cost, cost_of_labor_per_sq_yd,
flooring_cost, pad_cost, labor_cost, total_discount );
----- end

It says here that the Code called to undefined function 'compute_costs'.

It also says in this same area that total_discount is undefined. where do I define it? In the int main function where this output of "compute_costs" is?





Thanks a lot, if you need any more info, plwease let me know

I assume that is the fxn prototype. of what type are the parameters? int, double, char ?

also, it's most likely where you call compute_costs, you probably did not provide sufficient parameters.

try and figure it out with this, but if you need more help, more code is needed.

I'll post the whole program. its sorta long. Forgive me if its not appropriate.

------ Code Beg0n-----------------------------------





#include <iostream>
#include <iomanip>
#include <cstring>
#include <math.h>

double get_square_yards( double length, double width );
double calc_flooring_pad_cost( double unit_cost, double square_yardage );
double calc_cost_of_labor ( double labor_unit_cost, double square_yardage );
void find_discount ( string id_number, double & carpet_discount, double & pad_discount,
double & labor_discount );
void print_receipt();


int main()
{
string id_number, type_of_room, type_of_flooring, color_of_carpet;
double room_length, room_width, flooring_unit_cost, room_square_yardage;
double flooring_cost, flooring_pad_unit_cost, pad_cost, cost_of_labor_per_sq_yd;
double labor_cost;

flooring_pad_unit_cost = 2.25;
cost_of_labor_per_sq_yd = 2.40;

// Get customer id number.
cout << "Please enter your 5 digit identification number: ";
cin >> id_number;

if ( id_number.length() != 5 )
{
cout << "Your identification number should be 5 digits long." << endl;
return 1;
}


// get type of room
cout << "What room would you like new flooring for ('diningroom', 'livingroom', 'bedroom', 'study')? ";
cin >> type_of_room;

// get dimensions of room
cout << "What is the length of the room (in feet)?";
cin >> room_length;
cout << "What is the width of the room (in feet)?";
cin >> room_width;

// get type of flooring
cout << "What type of flooring are you purchasing ('carpet', or 'wood_flooring')?";
cin >> type_of_flooring;

// get color of carpet if the flooring is actually carpet
if ( type_of_flooring == "carpet" )
{
cout << "What color carpet are you purchasing?";
cin >> color_of_carpet;
}

// get flooring cost per square yard
cout << "How much does the " << type_of_flooring << " cost per square yard?";
cin >> flooring_unit_cost;

compute_costs ( id_number, room_length, room_width, flooring_unit_cost,
flooring_pad_unit_cost, cost_of_labor_per_sq_yd,
flooring_cost, pad_cost, labor_cost, total_discount );

}

void compute_costs (
string id,
double room_length,
double room_width,
double flooring_unit_cost,
double flooring_pad_unit_cost,
double labor_unit_cost,
double & flooring_cost,
double & pad_cost,
double & labor_cost,
double & total_discount
)
{
double carpet_disc, pad_disc, labor_disc;
double room_area;

find_discount ( id, carpet_disc, pad_disc, labor_disc );

room_area = ceil ( room_length * room_width / 9.0 );

flooring_cost = room_area * flooring_unit_cost;
pad_cost = room_area * flooring_pad_unit_cost;
labor_cost = room_area * labor_unit_cost;

total_discount =
( flooring_cost * carpet_disc ) +
( pad_cost * pad_disc ) +
( labor_cost * labor_disc );
}

void find_discount ( string id, double & carpet, double & pad, double & labor )
{
carpet = 0.0;
pad = 0.0;
labor = 0.0;

if ( id == "81429" )
{
carpet = 0.08;
labor = 0.06;
}
else if ( id == "04246" )
{
carpet = 0.12;
pad = 0.12;
labor = 0.12;
}
else if ( id == "39050" )
{
// No discount.
}
else if ( id >= "00001" && id <= "10000" )
{
carpet = 0.12;
pad = 0.12;
labor = 0.12;
}
else if ( id >= "10001" && id <= "20000" )
{
carpet = 0.10;
pad = 0.10;
labor = 0.10;
}
else if ( id >= "20001" && id <= "50000" )
{
carpet = 0.08;
pad = 0.08;
labor = 0.08;
}
else if ( id >= "50001" && id <= "70000" )
{
carpet = 0.06;
pad = 0.06;
labor = 0.06;
}
}


--------------------------------- end code----------------------

from a quick scan, compute_costs, needs to be prototyped above main.

You probably haven't written out what compute_costs() is supposed to do, or you are trying to send parameters to compute_costs() that don't appear in the prototype, or not enough parameters to satisfy the prototype. Given the second error regarding total_discount the error here probably interacts with the first one. Check your global and local variable lists to make sure that total_discount has been declared somewhere before you use it as a parameter. Where you declare it is up to you. You should also give it a meaningful value before you try to send it to a function as a parameter.

In looking at your code posted as I posted my response initially I can't see any declaration for total_discount before it being passed and no prototype for compute_cost() before it is called.