what is a string?

[Alberto Candel]

I cannot find proper documentation in the user guide, but my understanding was that a string is a sequence of characters enclosed in quotation marks, like "1234"

Maybe someone knows: are the quotation marks part of the string?

I ask because programs like this, where one wants to use the output as the input for another program. For example

EXPORT bin(N)
BEGIN
LOCAL B:="";
WHILE N >0 DO
IF FP(N/2)=0 THEN B:=B+"0";
ELSE B:=B+"1";
END;
N:=IP(N/2);
END;
RETURN B;
END;

bin(N) returns the binary expansion of the integer N. In Home or CAS, bin(13) returns "1011" with quotation marks. Replacing RETURN B with PRINT B and running the program, returns 1011 to the output screen, without the quotation marks.

I hope someone knows what is going on here. Thank you.