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Section 4 - Data Types

In MQL4 have 7 types of data:

1. Integer (int)
= Integer number not use commas, up from -2 billion +2 billion

code:
int A=1;

2. Boolean (bool)
Boolean values can only be right or wrong (true or false)

code:
bool SpreadProtection=true;

3. Character (int)
Char This content is only 1 letter / symbol only, use the declaration to int, because the stored number is an ascii

code:
int char1='A';

only 1 letter, and followed by quotation marks 1

4. String (string)
String = sentence/words

code:
string commentOrder="Order by EA1";

use the words in quotes ( ")

5. Double (double)
with the exact same integer, only to double this number using commas

6. Color (color)

Color is a color save information ...
function-function Those parameters have a certain color, to set the arrow color chart its ....
for example OrderSend

code:
color WarnaBuy=Red;
OrderSend(Symbol(),OP_BUY,1,Ask,3,Ask-25*Point,Ask+25*Point,"My order #2",16384,0,WarnaBuy);

color is most easily written it (Red, Blue, Green, etc.), or use of the RGB integer value to its .. but I like colors are quite common, is not it only charting a course, not the painting. Color options can be set in the colors on the Web - MQL4 Documentation

7. Datetime (datetime)

Datetime to save this date and time information to a variable

function above, the time now with the date and time expired EA stored in a variable ...
besides, usually datetime is used to set the expire time of the order pending

D'dd format. mm.yy HH: MM: SS '

Hopefully useful to all of us ..
Click the register when you are ready!

Section 5 - Plans and expressions: the operator and its expression in the MQL4 example.