CALL SYMPUTX: How to eliminate a redundant macro parameter

[SASdevAnneMarie]

Hello Experts,

My code in data _null_  is  :

            CALL SYMPUTX(COMPRESS('NOM_Mode_n1'),propcase(lb_lg_1));
            CALL SYMPUTX(COMPRESS('NOM_Mode_n2'),propcase(lb_lg_2));
			CALL SYMPUTX(COMPRESS('NOM_Mode_n3'),propcase(lb_lg_3));
			CALL SYMPUTX(COMPRESS('NOM_Mode_n4'),propcase(lb_lg_4));
			CALL SYMPUTX(COMPRESS('NOM_Mode_n5'),propcase(lb_lg_5));
			CALL SYMPUTX(COMPRESS('NOM_Mode_n6'),propcase(lb_lg_6));
			CALL SYMPUTX(COMPRESS('NOM_Mode_n7'),propcase(lb_lg_7));
			CALL SYMPUTX(COMPRESS('NOM_Mode_n8'),propcase(lb_lg_8));

I would like to reduce the code with this line :

    %do i=1 %to 8;
CALL SYMPUTX(COMPRESS('NOM_Mode_de_gest_n&i.'),propcase(lb_lg_gar_1));
%end;

But while running this code  I have an error message:

ERROR: Symbolic variable name NOM_MODE_DE_GEST_N&I. must contain only letters, digits, and underscores.
NOTE: Argument 1 to function SYMPUTX('NOM_Mode_de_'[12 of 21 characters shown],' '[12 of 50 characters shown]) at line
486 column 10 is invalid.

Could you help me please to resolve this error ?

Thank you !

[Patrick]

Use double quotes.

What's the purpose of the compress() function in above expression?

[Astounding]

Since you are running a DATA step, you need to use a DO loop, not a %DO loop.  For example,

array lb_lg_ {8};
do i=1 to 8;
   call symputx('NOM_Mode_n' || put(i, 1.), propcase(lb_lg_{i}));
end;