MT4 input extern
Wondering, how difference between MT4 input and extern. Both variable used for specific variable, which in visual programming like, Visual basic, C#, Delphi or Lazarus those would know in properties section.
input and extern in MT4 is the variable, which used in MA, some programmer call global variable
input
A variable with the input modifier can't be changed inside mql4-programs
extern
extern ones also determine the input parameters of an mql4 program. They are available from the Properties window, values of extern variables can be modified in the program during its operation.
note: photo by doc mql4
Global Variables
Global variables are created by placing their declarations outside function descriptions, they are not local in any block. Global variable can be used in any function of EA.
Example:
int GlobalFlag=10; // Global variable
int OnStart()
{
...
}
Short note buy and sell
Open Buy use ask price
TP buy use ask price
Open Sell use bid price
TP sell use bid price
