Why?

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Why does this

SomeDouble=SomeDouble*-1;

Causes a ea to fail to compile, while this

SomeDouble=-1*SomeDouble;

Works fine?

[Simon Gniadkowski]

tonny:

Why does this

Causes a ea to fail to compile, while this

Works fine?

Because . . . https://www.mql5.com/en/forum/147356

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So is this a bug in mt4?

[Simon Gniadkowski]

tonny:
So is this a bug in mt4?

Nope, not a bug . . . would you expect this to work ?

SomeDouble = SomeOtherDouble * + 10;

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RaptorUK:

Nope, not a bug . . . would you expect this to work ?

But i think the ide can be made to tolerate it like other ide's.

[Simon Gniadkowski]

tonny:
But i think the ide can be made to tolerate it like other ide's.

Maybe . . . I don't find it an inconvenience.

[Alain Verleyen]

RaptorUK:

Nope, not a bug . . . would you expect this to work ?

It could, but not with mql4 designed at this moment.

However it will probably work with the new compiler (as in mql5). A lot of programming language have the concept of unary, binary and even ternary operator. (as a side note mql4 documentation and book use incorrectly the word operator, probably a wrong translation).