Type of Array Needed to include Currency Pairs description ?
If u do it as a string array then any numerical part will have to be converted in order to be used as a number type (see conversion functions: https://docs.mql4.com/convert). But that would make the program much longer to code and much slower to execute. A more preferable method would be to use defines, such as:
#define SYM_EURUSD 0
#define SYM_EURCHF 1
etc...
This will allow u to use an array of doubles (unless u r absolutely sure u don't need doubles - then use an array of ints).
If u do it as a string array then any numerical part will have to be converted in order to be used as a number type (see conversion functions: https://docs.mql4.com/convert). But that would make the program much longer to code and much slower to execute. A more preferable method would be to use defines, such as:
#define SYM_EURUSD 0
#define SYM_EURCHF 1
etc...
This will allow u to use an array of doubles (unless u r absolutely sure u don't need doubles - then use an array of ints).
Hi Gordon,
I don't want to get into a position where I can't use numerical values and I want to keep the processing overhead low and the execution speed high, so I appreciate the info. Your suggestion sounds like the way to go.
For clairification: then I am correct in that I couldn use text strings in a numerical array, or is there some feature that will allow this?
.
The page link you posted for me comes back as being non-existent.
But I'm finding that the search feature here is quite erratic. I was going to post a query to find out if others had similar problems and it is something on the website Data Base management or if the trouble was at my end?
.
Thanks for your assistance Gordon, much appreciated (< 8)
Regards,
Doug
Hi Gordon,
I don't want to get into a position where I can't use numerical values and I want to keep the processing overhead low and the execution speed high, so I appreciate the info. Your suggestion sounds like the way to go.
For clairification: then I am correct in that I couldn use text strings in a numerical array, or is there some feature that will allow this?
Correct, you can't use text string in a numerical array. Using defines is a nice little trick of putting non-numerical data in a numeric array in a way which makes the code readable.
The page link you posted for me comes back as being non-existent.
But I'm finding that the search feature here is quite erratic. I was going to post a query to find out if others had similar problems and it is something on the website Data Base management or if the trouble was at my end?
.
Thanks for your assistance Gordon, much appreciated (< 8)
Regards,
Doug
The link works fine on my side. Try searching for conversion functions.
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Hi,
Still a NewtBee and WillBee for quite some time by the looks of things.
I’m creating an array that I want to store various information about trades such as their currency pairs descriptions, MagicNumbers, perhaps some text: Comments and WHU ???
Do I have to create and define it as a ‘string’ array in order to store text such as EURUSD and other text in it, or can I do this with a ‘double’ information type?
If I do create it as a string array, will other parts of the programs still recognize numbers stored in it as numerical values or will they subsequently only be seen as text strings ?
As always, thanks to one and all for any assistance!