User-defined functions

[naya22]

Hi.
I am trying to write a program that asks for the wholesale cost of an item and its markup percentage, and displays the retail price.
Well, I did that the regular way, but...

My instructions require for me to:
*Create a function that accepts the wholesale cost and markup percentage as arguments
*Returns the retail price of the item
*Do not accept negative values for either the wholesale cost of the item or the percent markup.

I have read my book, but I have no idea how to create a function for wholesaleCost and markupPrice. I tried, but I got an error.
Here is my regular program (without the user-defined function):

#include <iostream>
#include <iomanip>
#include <conio>
using namespace std;
int main()
{
        double wholesaleCost, markupPercentage, markupAmount, retailPrice;
        cout << "What is the wholesale cost of the item? ";
        cin  >> wholesaleCost;
        cout << "What is the markup percetage for this item? ";
        cin  >> markupPercentage;
        markupAmount = wholesaleCost * markupPercentage;
        retailPrice = wholesaleCost + markupAmount;
        cout << fixed << showpoint <<setprecision(2);
        cout << "Your retail price for this item is $" <<retailPrice <<endl;
        getch();
        return 0;
}

Does anyone have any idea how I can do this?? Any input is appreciated.

[mariocatch]

#include<iostream>
usingnamespace std;
#include<iomanip>
double CalculateMarkUpAmount(double, double);
double CalculateRetailPrice(double, double);
 
int main()

{[INDENT]double wholesaleCost, markupPercentage, markupAmount, retailPrice;[/INDENT]

[INDENT]cout << "What is the wholesale cost of the item? ";[/INDENT][INDENT]cin >> wholesaleCost;[/INDENT]

[INDENT]cout << "What is the markup percetage for this item? ";[/INDENT][INDENT]cin >> markupPercentage;[/INDENT]

[INDENT]markupAmount = CalculateMarkUpAmount(wholesaleCost, markupPercentage);[/INDENT]

[INDENT]retailPrice = CalculateRetailPrice(wholesaleCost, markupAmount);[/INDENT]

[INDENT]cout << fixed << showpoint <<setprecision(2);[/INDENT]

[INDENT]cout << "Your retail price for this item is $" <<retailPrice <<endl;[/INDENT]

[INDENT]cin.get();[/INDENT]

[INDENT]return 0;[/INDENT]}
 
double CalculateMarkUpAmount(double wholeSale, double markUpPercent)
 

{[INDENT]return wholeSale * markUpPercent;[/INDENT]}
double CalculateRetailPrice(double wholeSale, double markUpAmount)
 

{[INDENT]return wholeSale + markUpAmount;[/INDENT]}

So take a look at what I did, and compare that to the long long long tutorial i wrote on how to use functions in your other post.

[thekashyap]

Don't forget to check for negative part..
You'll need to change the return type probably or throw an exception, if you already know how to..