C++ Data Parsing query - c++

Question

Hello guys i hope you could enlighten me with this issue i am facing!
Initial Output:
The sample text file is below and the format is as follow (Item Desc:Price:Quantity:Date).
STRAW:10:10:11NOV1991
BARLEY:5.10:5:19OCT1923
CHOCOLATE:50:50:11NOV1991
I am required to print out a daily summary report of the total amt of sales on that day. Based on the sample above, the result will be on 11 NOV 1991 the total amt of sales(2 items) will be 60 while on 19OCT1923 the total amt of sales(1 item) will be 5.
Desired Output:
11Nov1991 Total amt of sales:60
19Oct1923 Total amt of sales:5
My question is, how do i generate the code to show only one unique date with the total amount of sales? I have created a loop to check if that a certain year exist for testing purposes but it isn't working. I want it to be able to iterate through a file and check if a certain year exist and if it exist already, the next vector element that has the same year won't be written to a file but instead only the item price will be added. Below is the code i am trying to implement.
ifstream readReport("DailyReport.txt");
ofstream writeDailyReport("EditedDailyReport.txt");
string temp1 = "";
//Read from empty report.txt
while(getline(readReport,temp1))
{
for(int i=0; i < itemDescVec.size(); i++)
{
stringstream streamYearSS;
streamYearSS << itemDescVec[i].dateYear;
string stringYear = streamYearSS.str();
size_t found1 = temp1.find(stringYear);
//If can find year
if (found1 != string::npos )
{
cout << "Can find" << endl;
}
//If cannot find year
else if (found1 == string::npos )
{
cout << "Cannot find" << endl;
writeDailyReport << itemDescVec[i].itemDescription << ":" << itemDescVec[i].unitPrice << ":"
<< itemDescVec[i].quantity << ":" << itemDescVec[i].dateDay << "/" << itemDescVec[i].dateMonth << "/" << itemDescVec[i].dateYear
<< endl;
}
}
}
readReport.close();
writeDailyReport.close();
remove("DailyReport.txt");
rename("EditedDailyReport.txt", "DailyReport.txt");

Answer 1

It would be better to use your own object to store the data - then you can write, for example, salesRecord.quantity (or salesRecord.getQuantity() if you have written a getter) instead of salesrecord.at(2). This is a lot more readable and is better practice than remembering that 2 = quantity (etc.).
Now as to your actual question... I would say something like this:
Iterate over the list. For each item:
Check if the date of the item has already been added to your new list.
If the date does not already exist, simply add the item in its entireity.
If it does already exist, edit the existing item such that previousQuantity += quantityToAdd
On the sorted list
BARLEY:5.10:5:19OCT1923
STRAW:10:10:11NOV1991
CHOCOLATE:50:50:11NOV1991
this would work as follows:
Try to add barley data - nothing for that date so far, so add it:
19OCT1923 - 5 units
Try to add strawberry data - nothing for that date so far, so add it:
19OCT1923 - 5 units
11NOV1991 - 10 units
Try to add chocolate data - 11NOV1991 already exists, so add 50 to the 10 that's already there:
19OCT1923 - 5 units
11NOV1991 - 60 units