Simple Question on C++ Noob

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Okay guys So I have an exercise to do for a book store program in c++ primer. It is a book but I can't do this exercise :/

Write a program that reads several transactions for the same
ISBN. Write the sum of all the transactions that were read. (This is what I have to do)

I made a code that will add two together but How can I modify it to allow unlimited inputs.

C++

#include <iostream>
#include "Sales_item.h"
int main()
{
Sales_item item1, item2;
std::cin >> item1 >> item2; // read a pair of transactions
std::cout << item1 + item2 << std::endl; // print their sum
return 0;
}

I would like to to read multiple inputs and allow me to end statement to print result. It's a noob question I know. Any help would be appreciated :)

Posted 27-Jan-14 6:52am

MoltenVidia

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Sergey Alexandrovich Kryukov 27-Jan-14 14:09pm

How come you call the pair of objects read from input a "transaction"?
—SA

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Albert Holguin · Answer 1 · 2014-01-27T07:22:00

Solution 1

Loop! ...create a loop that reads input data and store it off to an array. If you don't want to do the array size management yourself, use a container of some sort such as a std::vector (containers are just helpers that "contain" the actual data array internally).

Posted 27-Jan-14 7:22am

Albert Holguin

CdnSecurityEngineer · Answer 2 · 2014-01-27T07:23:00

You could use a linked list, of indeterminate size or consider http://www.cplusplus.com/reference/vector/vector/vector/ Then all you need to do is loop until end command entered, add values to your vector, after your end command entered, get an iterator to the vector create a simple variable to store the sum, sum everything in your vector while you iterate over the loop.

The concept is the same for a linked list, however one allows you to use the stl (vector) the other approach using a linked list doesn't have to.