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This is my header file i want to use

```
#include <stdio.h>
#define my
#define LABOR_COST 0.35
#define TAX_RATE .085
void read_data(int* length, int* width, int* customerdiscount, double* costpersquarefoot);
void calculate_values(int length, int width, int customerdiscount, double costpersquarefoot, int* area,
double* carpetcharge, double* laborcharge, double* installedpricecharge,
double* discountcharge, double* subtotalcharge, double* taxcharge, double* totalcharge);
void calculate_installedprice(int length, int width, int customerdiscount, double costpersquarefoot, int* area,
double* carpetcharge, double* laborcharge, double* installedpricecharge);
void calculate_subtotal(double* discountcharge, double* subtotalcharge, double carpetcharge, double laborcharge, int customerdiscount);
void calculate_price(double* taxcharge, double* totalcharge, double subtotalcharge);
void printresults(int length, int width, int area, double carpetcharge, double laborcharge, double installedpricecharge,
double discountcharge, double subtotalcharge, double taxcharge, double totalcharge, double costpersquarefoot);
void printmeasurements(int length, int width, int area);
void printcharges(double carpetcharge, double laborcharge, double installedpricecharge, double discountcharge,
double totalcharge, double taxcharge, double mcostpersquarefoot, double subtotalcharge );
```

this is my main:

```
#include <stdio.h>
#include "my.h"
int main(void)
{
int length, width, customerdiscount, area;
double costpersquarefoot, carpetcharge, laborcharge, installedpricecharge, discountcharge, subtotalcharge, taxcharge, totalcharge;
read_data(&length, &width, &customerdiscount, &costpersquarefoot);
calculate_values(length, width, customerdiscount, costpersquarefoot, &area,
&carpetcharge, &laborcharge, &installedpricecharge,
&discountcharge, &subtotalcharge, &taxcharge, &totalcharge);
printresults(length, width, area, carpetcharge, laborcharge, installedpricecharge,
discountcharge, subtotalcharge, taxcharge, totalcharge, costpersquarefoot);
return 0;
}
```

these are a couple of my functions:

```
#include "my.h"
#include <stdio.h>
void read_data(int* length, int* width, int* customerdiscount, double* costpersquarefoot)
{
printf("Length of room (feet)?");
scanf("%d\n", *length);
printf("Width of room (feet)?");
scanf("%d\n", *width);
printf("Customer discount (percent)?");
scanf("%d\n", *customerdiscount);
printf("Cost per square foot (xxx.xx)?");
scanf("%6.2f\n", *costpersquarefoot);
return;
}
```

```
#include "my.h"
#include <stdio.h>
void calculate_values(int length, int width, int customerdiscount, double costpersquarefoot, int* area,
double* carpetcharge, double* laborcharge, double* installedpricecharge,
double* discountcharge, double* subtotalcharge, double* taxcharge, double* totalcharge)
{
calculate_installedprice(length, width, customerdiscount, costpersquarefoot, &area,
&carpetcharge, &laborcharge, &installedpricecharge);
calculate_subtotal(&discountcharge, &subtotalcharge, carpetcharge, laborcharge, customerdiscount);
calculate_price(&taxcharge, &totalcharge, subtotalcharge);
return;
}
```

what i'm having a problem with is the pointers are not working the way i need them to and im getting a winmain@16 error when i compile. no matter how much i read about pointers i don't fully understand them. Any help would be great.

In this function im getting an error that says invalid operands to binary -(have double and double*)

```
#include "my.h"
#include <stdio.h>
calculate_subtotal(double* discountcharge, double* subtotalcharge, double carpetcharge, double laborcharge, int customerdiscount)
{
customerdiscount = customerdiscount/100;
*discountcharge = carpetcharge + laborcharge * customerdiscount;
*subtotalcharge = laborcharge+carpetcharge-discountcharge;
return ;
}
```