Ah, I see.
From the MI description: "The addition operation is performed according to
the rules of algebra." What exactly do "rules of algebra" mean in this context? Is it byte1 + byte2? Or 4bytes + 4bytes? Perhaps we can emulate the operation in C. Elvis -----Original Message----- Subject: Re: [MI400] C version of ADDLC on very long variables S for short form? DCL DD A CHAR(68); DCL DD B CHAR(68); ADDLC A, A, B; // is the same as: ADDLC(S) A, B;