C++ Project Help

[aitf311]

Hi, I am new to C++ and I have a project due on friday. This is out first week with structures and I am struggling. I am trying to be able to pick a plant, get a count on how many of this plant and then calculate a price....each thing having a seperate function. Can someone help me out with what I am doing wrong on the third function?

#include

using namespace std;

struct plant

{

int choice;

float price;

float quantity;

};

plant pick(plant tulip);

//Pre: none

//Post: user has been informed of choices and passed on valid choice

//plant cost(plant tulip);

//Pre: need choice to be made and valid, and number of plants

//Post: cost of plant wanted * number desired

plant amount(plant tulip);

plant cost( int choice, int quantity, plant tulip);

int main()

{

plant plantChoice, plantQuantity, plantCost;

int totalCounter, counter;

plantChoice.choice = 1;

plantChoice.price = 1;

plantChoice.quantity = 1;

//plantChoice = pick(plantChoice);

//plantQuantity = amount(plantQuantity);

plantCost = cost( plantChoice, plantQuantity, plantCost);

return 0;

}

plant pick(plant tulip)

{

int counter;

cout << "Follow the onscreen instructions and press 0 to quitn"; //directions

cout << "The following plants are available: nn";

cout << "Plant#tPricen1t4.95n2t2.95n3t14.95n4t12.95n5t7.95n" << endl; //plant info

cout << "Please enter the plant# you would like (0 to quit): ";

cin >> tulip.choice;

while ((tulip.choice >5) || (tulip.choice <0)) // makes sure the plant# entered is valid

{

cout << "Enter a valid plant#.n";

cin >> tulip.choice;

}

switch (tulip.choice) //sets the price of the plant

{

case 0:

break;

case 1:

tulip.price=(float)4.95;

break;

case 2:

tulip.price=(float)2.95;

break;

case 3:

tulip.price=(float)14.95;

break;

case 4:

tulip.price=(float)12.95;

break;

case 5:

tulip.price=(float)7.95;

break;

default:

cout << "You did not enter a correct plant#." << endl;

}

return tulip;

}

plant amount(plant tulip)

{

cout << "How many sold: ";

cin >> tulip.quantity;

if (tulip.quantity < 0) //makes sure the number entered is positive

{ cout << "nPlease enter a positive number this time..." << endl;

cout << "How many sold: ";

cin >> tulip.quantity;

}

return tulip;

}

plant cost( int choice, int quantity, plant tulip)

{

choice = pick(tulip)

quantity = amount(tulip)

float price;

switch (choice) //sets the price of the plant

{

case 0:

break;

case 1:

price=(float)4.95;

break;

case 2:

price=(float)2.95;

break;

case 3:

price=(float)14.95;

break;

case 4:

price=(float)12.95;

break;

case 5:

price=(float)7.95;

break;

default:

cout << "Something went wrong!" << endl;

}

return tulip;

}

[smurfiness]

The problem is that you're trying to redefine parameters that are passed to your function. You can't do this.

Originally posted by aitf311

<pre>

plant cost( int choice, int quantity, plant tulip)

{

	choice = pick(tulip)

	quantity = amount(tulip)



        ******snip******



        return tulip;

}

</pre>

Here is what you should have done instead:

<pre>

plant cost(plant tulip)

{

        int choice = pick(tulip);

        int quantity = amount(tulip);



        ******snip******



        return tulip;

}

</pre>

Variables that you need to use inside the function should be declared inside the function if you need to modify them.

[DrunkenMaster]

Yeah, I just had an assignment to do last night with structs. Stayed up late doing it. I had to make members of structs within another struct and one of the structs had to keep all the data of the other stucts in an array. Now I have to do the same program only with classes bleh :dead:

If you need some help with some assignments, send me a PM on the board and I'll offer some advice. At least we can both learn by explaing stuff to each other.