Section 3 - Syntax and Basic Things

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» Learn MQL4
	Section 1 Introduction: the uses and about MQL4. Section 2 Simple Example of EA: the Expert Advisor, its example Section 3 The Syntax and Basics: the variable and comments. Section 4 Data Type: the type of data on MQL4 with examples. Section 5 Plans and expressions: the operator and its expression in the MQL4 example. Section 6 Decision and Looping: the use of branching and looping to set the EA program flow. Section 7 Order and Technical Analysis: EA discusses how to create order and make use technical indicators. Section 8 Developing EA: discuss how to prepare EA. It is expected that the reader is able to make a simple EA. Section 9 Use iCustom: discuss how to prepare the EA based on a custom basis entry indicator.

Syntax of this MQL4 similar c / c + +.

We go one by one

1. Variable Declaration and Naming

valid:

code:


double aa;

double aaa,bbb;

double aaaa=1;

double bb,cc=2;

double a=0,b=1;

double d=2,

  e=3,

                        f=4;

double data type that it can be replaced int, string, bool, etc.
a-f is the name variablenya.

so essentially (the most simple)

code:
tipe_data nama_variabel = value;

that are used to coding, such as the above combination can also be used

I want to be constrained even though changed by the user, just add extern
so:

code:
extern tipe_data nama_variabel = value

well, the name variable is case sensitive. Nama_Variabel different same nama_variabel

for the array, will be explained in other parts. (usually if beginners rarely use an array)

rules for naming variables:

- Max length 31 characters
- Must start uppercase, lowercase, or _ (not numbers or symbols other than _)
- Can not use the keyword

examples keyword: bool, color, extern, static, Case, Else, If, true, false and others

2. Comment

to write a comment, there are 2 ways
1. add / / at the beginning of the sentence
2. use / * * /

example

code:
stoploss int = 10; / / stoploss of trade

code:
/* Stoploss filled in the point * / stoploss int = 10;

sentence after / / on the same line will not be read by any program and followed by / * and * / will not read by the program.

Hopefully useful to all of us ..
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