C/C++ :: Display Unique Date And Its Related Price Found In Txt File

Currently i have a system that will store user input into a txt file, and have a function that will compute the daily sales of the month(Check by system date month) and display the sales of the day and the grand total of that month.

Take for example, the system date now check that the current month is Apr. Below are my current output:

20Apr2015 $11.5
20Apr2015 $15.5
22Apr2015 $4.5
25Apr2015 $4.5
28Apr2015 $4.5
20Apr2015 $4.5
Grand Total $45

But my desired result should be as below

20Apr2015 $31.5
22Apr2015 $4.5
25Apr2015 $4.5
28Apr2015 $4.5
Grand Total $45

Textfile data:

1|Bag|2|3|6|20Apr2015
2|Fruit|2.3|5|11.5|20Apr2015
3|Fruit|2.3|5|15.5|20Apr2015
4|Water|0.9|5|4.5|22Apr2015
5|Water|0.9|5|4.5|25Apr2015
6|Water|0.9|5|4.5|20Jul2015
7|Water|0.9|5|4.5|20Jul2015
8|Water|0.9|5|4.5|28Apr2015
9|Water|0.9|5|4.5|20Apr2015

Below are my code.

struct TransactionPile {
// to record item information.
string itemid;
string itemdesc;
float unitprice;
int quantity;
float totalprice;
string date;

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