in mql5 why if i declare variable is not possible change ?

[faustf]

hi i have  declare in top of script  this code

input int      OnOffChiusuraAuto=0;  

but why when i try to chage   return me  'OnOffChiusuraAuto' - constant cannot be modified    SPREAD_ROBOT.mq5    297    9

but is variable not constant o_O

[William Roeder]

An input variable is a constant variable.

[faustf]

and of course not exist a mode for give a  input variable and remaning variable?

[Emanuel Cavalcante Amorim Filho]

Just assign its value to a non-input variable on the OnInit function and manipulate it as you want:

int vOnOffChiusuraAuto;

int OnInit()
{
vOnOffChiusuraAuto = OnOffChiusuraAuto;

vOnOffChiusuraAuto += 1;

//etc...

return INIT_SUCCEEDED;
}