Constraining int type to constant name only

ChrisJL — Sat, 19 Nov 2016 22:37:13 +0800

In mql4, does anyone know how to restrict integer orderType to constant name only? I am using orderType to accept values from constants such as OP_BUY (equiv to 0), OP_SELL (equiv to 1), OP_BUYLIMIT, or OP_SELLLIMIT, etc.

This is my structure,

CODE

// Structure to store the order information -> ticket no, stop lost price etc.
struct tradeStruct
{
int ticket;
int orderType;
double orderOpenPrice;
double stopLostPrice;
double minClosePrice;
double activator;
};
tradeStruct trades[];

And I want it like trades[0].orderType = OP_BUY only (restricted), instead of allowing trades[0].orderType = 0

I don't think this is possible in mql4/mql5 unless I am using enum to replace the int type orderType. But who knows maybe someone can show me some amazing techniques?

Undestanding DP solution for knapsack problem

ChrisJL — Thu, 05 Nov 2015 15:07:39 +0800

Help!

Does anyone master at dynamic programming?

can anyone describe in simplest terms why with dynamic programming we can get the result for the problem below??

For example, suppose you are a thief and you invaded a house. Inside you found the following items:

1. A vase that weights 3 pounds and is worth 50 dollars.
2. A silver nugget that weights 6 pounds and is worth 30 dollars.
3. A painting that weights 4 pounds and is worth 40 dollars.
4. A mirror that weights 5 pounds and is worth 10 dollars.

determine which items you should pick to maximize the value while keeping the overall weight smaller than the limit of your knapsack i.e. 10.

Answer is 90. yes, but how the logic of top down dp works to achieve that?

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Constraining int type to constant name only

Undestanding DP solution for knapsack problem