INTPREC - Integer Intermediate Precision - Supported RPG Features

The INTPREC keyword on CTL-OPT (or H-spec) specifies the decimal precision of integer and unsigned intermediate values in binary arithmetic operations (+, -, *, /) within expressions.

Value	Meaning
`INTPREC(10)`	10-digit precision for integer/unsigned intermediates (default)
`INTPREC(20)`	20-digit precision - prevents high-order truncation in large integer arithmetic

If at least one operand is an 8-byte integer or unsigned field (INT(20) / UNS(20)), the result always uses 20-digit precision regardless of INTPREC.

CTL-OPT INTPREC(20);
DCL-S A INT(10) INZ(100000);
DCL-S B INT(10) INZ(100000);
DCL-S Result PACKED(15:0);
Result = A * B;
DSPLY %CHAR(Result);  // → 10000000000

Fixed-format example:

     H INTPREC(20)
     D A               S             10I 0 INZ(100000)
     D B               S             10I 0 INZ(100000)
     D Result          S             15P 0
     C                   EVAL      Result = A * B
     C     Result        DSPLY