Learning the code syntax

[florenceale]

Hello what does it mean this expression?...I'm confused with ? : etc.

double price = (type == OP_SELL) ? Ask : Bid;

[Carl Schreiber]

Easiest and fastest way:

1. mark the ?
   
2. press F1
3. start reading!
   

[florenceale]

cant find anything in that way...

[William Roeder]

1. florenceale: what does it mean this expression?...I'm confused with ? : etc.

   Ternary Operator ?: - Operators - Language Basics - MQL4 Reference

2. florenceale: cant find anything in that way...

   Why not?
   

   
   

[florenceale]

yes thanks i had found it but by google. It means either or.

[Fernando Carreiro]

florenceale: Hello what does it mean this expression?...I'm confused with ? : etc.

// Concise version
double price = (type == OP_SELL) ? Ask : Bid;

// Verbose version
double price;
if (type == OP_SELL)
   price = Ask;
else
   price = Bid;

// Yet another version
double price = Bid;
if (type == OP_SELL) price = Ask;

[Fernando Carreiro]

Comments that do not relate to this topic, have been moved to "Need help with Custom Indicator code — the separate window is empty".