NXC: compile error using FormatNum

[HaWe]

I get a compile error using FormatNum:

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int ibuf;
string s;
s=FormatNum("%d", ibuf)+";" ;

# Error: ';' expected
File "c:\Temp\temp.nxc" ; line 98
# s=FormatNum("%d", ibuf)+"
#----------------------------------------------------------

what's wrong?

[h-g-t]

Are you using the enhanced firmware?

int ibuf;
string s;
s=FormatNum("%d", ibuf)+";" ;

Should that not be :-
int ibuf;
string s;
s=StrCat(FormatNum("%d", ibuf),";" );

Just getting used to this C-based stuff so apologise if this is not helpful.

[HaWe]

as I just found out, this works:

Code: Select all

s=FormatNum("%d", ibuf);
s= s +";" ;

but this not:

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s=FormatNum("%d", ibuf)+";" ;

Using NumToStr instead of FormatNum is the same issue.

[hergipotter]

I don't think there's a "+"-Operator for strings in nxc, is it?

Did you try it as h-g-t suggested?

Code: Select all

s=FormatNum("%d", ibuf);
s= s +";" ;

Does this really work as expected?

[HaWe]

yes, it does
;)

[afanofosc]

NXC supports string concatenation using + in some limited cases. IIRC, that is only when you have a string variable and/or constant and the + sign.

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string a, b, c, d;
a = "123";
b = "456";
c = "789";
d = a + b + c + "0-=";

This will compile and work correctly but the NXC compiler does not currently support using the + for string concatenation in any other situation.

John Hansen

[HaWe]

thank you John for the clarification!
:)