Manipulating output c++

Question

I am new to C++ and I am trying to write a simple grocery shopping app, the input is in a format something like this:

Item Name
someid expiryDate manufacturerId cost

An example is:

Shampoo 8879 05 04 2015 1010 100.03

I want to format it in such a way that: 8879 05/04/2015 1000 $100.03 .....etc

How do I achieve this?

My attempt:

I tried using substring and then breaking the input down and then outputting in the required format but the issue i came across was that for example the price can be something like 45.00 then my approach would fail.

How can I achieve this?

Thank you

@Matt I don't see any relevance mentioning XML formats here. — πάντα ῥεῖ, Oct 12 '15 at 19:28

GeneralFailure · Accepted Answer · 2015-10-12T19:55:53.500

If you are reading from the console input you can use cin and istringstream:

#include <iostream>
#include <string>
#include <sstream>

using namespace std;

int main()
{
    int id;
    int mm,dd,yy;
    int manufacturerId;
    double price;
    string priceString;
    char character; // used to read '/' and other symbols
    cin >> id >> mm >> character >> dd >> character >> yy >> manufacturerId;
    cin >> priceString;

    istringstream stream( priceString );
    stream >> character >> price;

    return 0;
}

Note: A nice approach if is to create your own struct/class for the complex objects (like date for example) to extract info and subclass operator>> for them.

struct date
{
    int month;
    int day;
    int year;
};

istream& operator>>(istream& stream,date& d)
{
    char character;
    stream >> d.month >> character >> d.day >> character >> d.year;

    return stream;
}

Then you can use

date d;
cin >> d

to read dates which is much more concise and keeps the code in main simple.

Thanks for your solution, but my question is little different. In the sense my input format is like: 8879 05 04 2015 1010 100.03. I basically want to take this input and then store them in variables like month, date, year, id, price, etc. Probably using a for loop. How do i achieve this? — Mathew, Oct 12 '15 at 19:54
Well in the code i have some variables( id, mm, dd, yy, price ) to hold this information and populate them when reading from input stream. If you run the code and paste 8879 05 04 2015 1010 $100.03 in the console you will have the data extracted in those variables. — GeneralFailure, Oct 12 '15 at 19:57

Manipulating output c++

1 Answers1