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Using %BIN to Change Case of Letters in CL Pgms

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Using %BIN to Change the Case of Letters in CL Programs

The EBCDIC representations of lowercase letters differ from those of uppercase letters only in bit 1 (the second bit from the left). If you treat the characters as unsigned binary integers, then the lowercase letters are 64 less than their uppercase counterparts. In other words, you can add 64 to a lowercase letter to capitalize it, and you can subtract 64 from an uppercase letter to make it lowercase.

You can use this method along with the %BIN function to capitalize characters in a CL program. %BIN requires a two- or four-byte argument, so you'll need to move the character to the low-order byte of a two-byte character field which has been initialized to binary zero. Add 64 to the field and then move it back. Refer to 1 for an example.

You can use this method along with the %BIN function to capitalize characters in a CL program. %BIN requires a two- or four-byte argument, so you'll need to move the character to the low-order byte of a two-byte character field which has been initialized to binary zero. Add 64 to the field and then move it back. Refer to Figure 1 for an example.

You may also use this method to capitalize the diacritic characters (e.g., those with accent marks or tildes); but the difference between lowercase and uppercase is 32, not 64.

Using %BIN to Change Case of Letters in CL Pgms

Figure 1 Changing Case in CL

 DCL VAR(&BINVAL) TYPE(*CHAR) LEN(2) VALUE(X'0000') DCL VAR(&MESSAGE) TYPE(*CHAR) LEN(80) DCL VAR(&N) TYPE(*DEC) LEN(3) DCL VAR(&ONECHAR) TYPE(*CHAR) LEN(1) ... /* If the &Nth character of &MESSAGE is a lowercase letter, + capitalize it */ CHGVAR VAR(&ONECHAR) VALUE(%SST(&MESSAGE &N 1)) IF COND((&ONECHAR *GE 'a' *AND &ONECHAR *LE 'i') *OR + (&ONECHAR *GE 'j' *AND &ONECHAR *LE 'r') *OR + (&ONECHAR *GE 's' *AND &ONECHAR *LE 'z')) THEN(DO) CHGVAR VAR(%SST(&BINVAL 2 1)) VALUE(&ONECHAR) CHGVAR VAR(%BIN(&BINVAL)) VALUE(%BIN(&BINVAL) + 64) CHGVAR VAR(%SST(&MESSAGE &N 1)) VALUE(%SST(&BINVAL 2 1)) ENDDO
TED HOLT

Ted Holt is IT manager of Manufacturing Systems Development for Day-Brite Capri Omega, a manufacturer of lighting fixtures in Tupelo, Mississippi. He has worked in the information processing industry since 1981 and is the author or co-author of seven books. 

MC Press books written by Ted Holt available now on the MC Press Bookstore.

Complete CL: Fifth Edition Complete CL: Fifth Edition
Become a CL guru and fully leverage the abilities of your system.
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Complete CL: Sixth Edition Complete CL: Sixth Edition
Now fully updated! Get the master guide to Control Language programming.
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IBM i5/iSeries Primer IBM i5/iSeries Primer
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