Add all my notes

imperfect_notes/pragy/Machine Coding Splitwise.md

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+Machine Coding Splitwise
+------------------------
+
+Create Splitwise
+----------------
+
+- Has everyone used splitwise?
+- Social expense management app
+- Simplifies bookkeeping amongst groups
+
+- start coding? yay? \o/
+- no. Requirements first
+
+Requirements
+------------
+
+> - A user can add an expense. While adding the expense, the amount can be split amongst any other users
+> - Expense can be of 3 types
+>     - split equally
+>         - take care of missing money
+>     - unequal: value
+>     - unequal: percentage
+> - The total expense must add up to 100% (or the total money value)
+> - Proper validation must be done for the expense
+>     - 2 decimals, because currency
+>     - 2 decimals for % as well
+> - Users must have their details
+> - Show expenses of user
+> - show balance report of all users
+> - Show balance report of a user against all users
+>   - don't show user if s/he has 0 balance against a user
+>  
+
+
+Input format
+------------
+
+> - record expense
+>     - who_paid
+>     - people in the group
+>     - expense type - equal/exact/percent
+>     - if expense is unequal - the values
+> - show all     - current balances
+> - show userid  - current balance
+> - passbook userid  - history
+> - simplify expenses
+> 
+> a -100-> b
+> b -100-> c
+>
+> a -100-> c
+>   
+
+Output format
+-------------