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Jul 21, 2010

use new to allocate a structure array

Score: 2.2/5 (52 votes)
*****
I searched the internet front and back looking for the answer to this problem. "Do programming exercise 4, but use new to allocate a structure instead of declaring a structure variable. Also, have the program request the pizza diameter before it requests the pizza company name."

I have a minor in computer science but since it has been a while since I have done any programing I wanted to put myself to the test and reinforce what I know and see if I can learn more on my own. Anyway I ran into this problem and could not find a good example to emulate so after many attempts I figured it out and I want to share my code with anyone who may run into this problem in the future or so that I can find it if I need to in the future. I used MS visual studios so adjust to your compiler.

for the first question always answer 3 or modify the code

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#include "stdafx.h" //you may have to remove this depending on you compiler
#include <iostream>

using namespace std;

struct Pizza_Analysis    //defining the struct
{
	char company_name[35];
	double  dia_of_pizza;
	double weight_of_pizza;
};

int main()
{
	int num_of_companies;


        //using new to allocate the structure
	Pizza_Analysis *ps = new Pizza_Analysis[3]; 
	
	cout << "How many companies do you want to look at? ";
	cin >> num_of_companies;
	cin.get();
        
        //the struct array at work
	for(int i=0; i<num_of_companies; i++)
	{
		cout << "\n\nPlease enter company name. ";
		cin.getline(ps<i>.company_name,35);

		cout <<"\n\nPlease enter the diameter of the pizza. ";
		cin >> ps<i>.dia_of_pizza;

		cout <<"\n\nPlease enter the weight of the pizza. ";
		cin >> ps<i>.weight_of_pizza;
		
		cin.get();
	}
	
	cout << endl << endl;
         
         //the struct array at work
         // prints the input to screen
	for(int i=0; i<3; i++)
	{
		cout << "Company Name : " << ps<i>.company_name << endl 
		 << "diameter of pizza : " << ps<i>.dia_of_pizza << endl
		 << "Weight of pizza : " << ps<i>.weight_of_pizza << endl <<endl;
	};


	delete [] ps;
	system("pause");//you may have to remove this depending on you compiler
	return 0;
}