Problem with arithmetic operand, used to work but now it doesn't.

Hi. I'm having a problem with two lines of code. In my first program, those two lines compiled with no problem. Now, as I redid the program to do arrays, now those two lines are giving me problems and I have not changed them. Here is my code with compile details. The offending lines are in main(), when I'm trying to multiply sale_comm.

rohan% vi project4.c
rohan% script output.out
Script started, file is output.out
rohan% cat project4.c

Code:

#define ZERO 0.0
#define COMMISSION_RATE 0.144
#define BONUS_COMM_RATE 0.188
#define TRUE 1
#define FALSE 0
#define HIGH_SALESPERSON 7
#define ARRAY_SIZ 75
#include <stdio.h>
int s_code[ARRAY_SIZ];
int c_code[ARRAY_SIZ];
double sale_amount[ARRAY_SIZ];
double sale_comm[ARRAY_SIZ];
int flag[ARRAY_SIZ];
void input_fun();
void output_fun();
int sales_code();
int cust_code();
double sale();
void comm_report (double comm, int bonus);
void sale_error();

main()
{  int num_sales, n;
   double total_sales, total_comm;
      input_fun();
      for (n =0; n < num_sales; n++)
         if (sale_amount[n] > 1450)
         {
            flag[n] = TRUE;
            sale_comm[n] = (208.8 + ((sale_amount - 1450) * BONUS_COMM_RATE));
         }
         else
         {
            flag[n] = FALSE;
            sale_comm[n] = (sale_amount * COMMISSION_RATE);
         }
         total_sales += sale_amount[n];
         total_comm += sale_comm[n];
         s_code[n] = sales_code();
      output_fun();
}


void
input_fun()
{
   int n, num_sales;
   s_code[n] = sales_code();
   while (s_code[n] != ZERO)
   {
      if (s_code[n] <= HIGH_SALESPERSON && s_code[n] > ZERO)
      {
         c_code[n] = cust_code();
         sale_amount[n] = sale();
         num_sales += 1;
         n++;
      }
      else
      {
         sale_error();
         s_code[n] = sales_code();
      }
   }
   return;
}

void
output_fun()
{
   int n, num_sales, flag;
   printf("\n\n        SALES REPORT");
   printf("\n\nSP CUST      SALE         COMM");
   for (n = 0; n < num_sales; n++)
   {
      printf("%d %3d  $%9.2lf\n", &s_code[n], &c_code[n], &sale_amount[n]);
      if (flag == TRUE)
      {
         printf("**");
      }
      else
      {
         printf("  ");
      }
      printf("  $%9.2lf", &sale_comm[n]);
   }
   return;
}



int
sales_code()
{
   int sval;
   printf("\n\nSalesperson code (1-7)(Enter 0 to quit): ");
   scanf("%d", &sval);
      return sval;
}

int
cust_code()
{
   int cval;
   printf("Customer code: ");
   scanf("%d", &cval);
      return cval;
}

double
sale()
{
   double amount;
   printf("Sale amount in dollars and cents: ");
   scanf("%lf", &amount);
      return amount;
}


void
sale_error()
{
   printf("Salesperson code must be 1 to 7");
      return;
}

rohan% cc project4.c
"project4.c", line 35: operands must have arithmetic type: op "*"
"project4.c", line 40: operands must have arithmetic type: op "*"
cc: acomp failed for project4.c

sale_amount is an array but you are using it without the subscript/indexing you probably should be using for the following lines:

Code:

sale_comm[n] = (208.8 + ((sale_amount - 1450) * BONUS_COMM_RATE));
sale_comm[n] = (sale_amount * COMMISSION_RATE);

Just a guess, but maybe it should be this instead?:

Code:

sale_comm[n] = (208.8 + ((sale_amount[n] - 1450) * BONUS_COMM_RATE));
sale_comm[n] = (sale_amount[n] * COMMISSION_RATE);

sale_comm[n] = (208.8 + ((sale_amount - 1450) * BONUS_COMM_RATE));

sale_amount is an array, not a single variable.

That's it! Thanks for your help.

Now I can work on debugging it, but that shouldn't be too bad.