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#1
October 23rd, 2005, 03:29 PM
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User defined functions
I am instructed to do the following:
Quote:
However, I'm not sure what the assignment means. Firstly, is "passed" supposed to be "past"? Also, what does it mean to "return a possibly modified price"? Can anyone give me an example of how to use functions? Here is my original code (which by the way, isn't even running due to the problem i mention here Code:
#include <stdio.h>
int main()
{
int prod_num, number, counter=0, major_code=0, minor_code=0,
tax_code=0, where=0, total_number=0;
double base_cost, minor_factor=0, shipping_costs=0, tax_amount=0,
final_unitprice=0,average_final, final_subtotal=0, final_price_product;
while ( scanf("%d %lf %d", &prod_num, &base_cost, &number) != EOF)
{
total_number += number;
counter++;
major_code = prod_num / 100000;
minor_code = (prod_num % 100000) / 100;
tax_code = (prod_num % 100) / 10;
where = prod_num % 10;
if(minor_code >= 0 && minor_code <= 399) {
minor_factor = 1.45;
}
else if ((minor_code>=400 && minor_code <=799) || (minor_code>=950
&& minor_code <=955)) {
minor_factor = 1.12;
}
else {
minor_factor = 0.89;
}
switch(where)
{
case 0: shipping_costs = 7.50;
break;
case 1: shipping_costs = 8.47;
break;
case 2: shipping_costs = 6.05;
break;
case 3: shipping_costs = 10.20;
break;
default: shipping_costs = 20.00;
break;
}
if(tax_code == 1)
{
if(major_code>=0 && major_code<=250)
tax_amount = 0.12;
else if(major_code>=251 && major_code<=450)
tax_amount = 0.15;
else
tax_amount = 0.25;
}
else if (tax_code == 0)
tax_amount = 0;
final_unitprice = (base_cost * minor_factor + shipping_costs) * (1 + tax_amount);
final_price_product = final_unitprice * number;
final_subtotal += final_price_product;
printf("---------------------------> PRODUCT [%d]<---------------------------\n", counter);
printf("\n");
printf("Product #: %d || Price/Unit: $%.2f || # of Products: %d ||
Total: $%.2f\n", prod_num, final_unitprice, number, final_price_product);
printf("\n");
printf("\n");
}
average_final = final_subtotal / total_number;
printf("\n");
printf("The total price is: $%.2f\n", final_subtotal);
printf("The average price per product is: $%.2f", average_final);
printf("\n");
return 0;
}
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#2
October 23rd, 2005, 04:04 PM
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dekoi
I got three questions for you.
Does this problem have to be done in C or can you use C++ as well? Let me see if I got this correct, do you need to read this from a seperate text file or no? and is this a problem to be done for school or is there no time frame? either way it doesn't matter just wondering.
__________________
---Official Member Of The Itsacon Fan Club---  Give a man a fish and he will eat for a day. Teach a man to fish and he will sit in a boat all day drinking beer.
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#3
October 23rd, 2005, 04:18 PM
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Quote:
C. It reads the input data from a seperate file. Due tuesday, at home. I'm confused as to why this matters.
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#4
October 23rd, 2005, 04:19 PM
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Well I briefly looked over your code and although I'm no expert, I look for compiler errors and try and solve the problem from there, first. So I solved the one problem it showed for the code and then I ran it. Then it had me enter 3 numbers and then computed an astronomical amount with a lot of zero's.
I have not even attempted this yet but you need to put more printf() or cout<< statements to let the user know what he's doing. Another suggestion would have more error testing or basically stopping the user from entering a incorrect amount. Just some suggestions no solution, but Ill try and look over it again although Michaelsoft the guy you were getting help from is far more knowledgeable than I.
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#5
October 23rd, 2005, 04:22 PM
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Well that only matters because I was going to re-write it in my own terms and I use a lot of stuff that is strictly C++ functions such as cout<< and cin>> statements that would not be compatable for C because they are usually used for C++ only.
And the time factor, well, I got homework of my own to do, so I was wondering if you got a little time for this assignment or if it was a personal project. And one other thing, if you are reading from a seperate data file why is it that you never open it to be read? just a thought. and another thing that I will show you below, how come you have or statement inside the printed portion of the printf? Code:
printf("Product #: %d || Price/Unit: $%.2f || # of Products: %d ||
Total: $%.2f\n", prod_num, final_unitprice, number, final_price_product);
if you want them to determine which is which you might want to consider placing them seperately. These are all just suggestions to try and help you, I am only a student too, but Im just trying to help you out a little. Last edited by Geo.Garnett : October 23rd, 2005 at 04:30 PM.
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#6
October 23rd, 2005, 04:54 PM
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Quote:
No, it's "passed". To "pass" something in this context means to provide it as an arguement to a function. For example, when you use the code printf("hi"); you're passing the string "hi" as an arguement to the function printf() Quote:
To "return" a value means that, when the function exits, it can return a value to the function that called it. "possibly modified" in the question simply means that the value you return may or not be modified by the code it passes through.
__________________
Officially a member of the Itsacon fan club. Beer blasts are every friday at Viper_SB's house. I bring the chips. 
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#7
October 23rd, 2005, 04:57 PM
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You don't quite understand. The code works fine on one computer and doesn't properly run on another. The input file is opened using the redirection with my compiler. And im using esentially the same compiler on both computers.
Here is the output on the good version: Quote:
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#8
October 23rd, 2005, 04:58 PM
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Quote:
Okay. Thank you. Im going to try something and get back to you.
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