Do Not Understand PROC FCMP for characters

[SAS4FUN1]

Studying for the SAS Advanced Cert exam and came across this problem in a practice exam. I do not understand why my PROC FCMP function does not return the same results as the same code in the data step. It only returns the first letter of the second word. 

data testscandata;
infile cards dsd dlm='|';
input one $ two $ one_two $;
datalines;
one|two|one two
one|two|one two
one|two|one two
one|two|one two
;
run;

PROC FCMP OUTLIB=WORK.FUNCTIONS.DEV;
FUNCTION scantx (STRING $) $ 100;
SCNOUT=catx(" ",scan(STRING,2), scan(STRING,1));
RETURN (SCNOUT);
ENDSUB;
RUN;

OPTIONS CMPLIB=WORK.FUNCTIONS;

DATA TEST_FUNC;
SET WORK.testscandata;
two_one_func = scantx(one_two);
two_one_test = catx(" ",scan(one_two,2), scan(one_two,1));
RUN;

[ballardw · Accepted solution]

Consider what the LENGTH you may have defined for the variable SCNOUT in the function might be.

See what happens with

PROC FCMP OUTLIB=WORK.FUNCTIONS.DEV;
FUNCTION scantx (STRING $) $ 100;
length scnout $ 100;
SCNOUT=catx(" ",scan(STRING,2), scan(STRING,1));
RETURN (SCNOUT);
ENDSUB;
RUN;

---

@SAS4FUN1 wrote:

Studying for the SAS Advanced Cert exam and came across this problem in a practice exam. I do not understand why my PROC FCMP function does not return the same results as the same code in the data step. It only returns the first letter of the second word. 

data testscandata;
infile cards dsd dlm='|';
input one $ two $ one_two $;
datalines;
one|two|one two
one|two|one two
one|two|one two
one|two|one two
;
run;

PROC FCMP OUTLIB=WORK.FUNCTIONS.DEV;
FUNCTION scantx (STRING $) $ 100;
SCNOUT=catx(" ",scan(STRING,2), scan(STRING,1));
RETURN (SCNOUT);
ENDSUB;
RUN;

OPTIONS CMPLIB=WORK.FUNCTIONS;

DATA TEST_FUNC;
SET WORK.testscandata;
two_one_func = scantx(one_two);
two_one_test = catx(" ",scan(one_two,2), scan(one_two,1));
RUN;

---

[SAS4FUN1]

Solved!

Thank you, this solution worked.