The INTPREC keyword is used to specify the decimal precision of integer and unsigned intermediate values in binary arithmetic operations in expressions. Integer and unsigned intermediate values are always maintained in 8-byte format. This keyword affects only the way integer and unsigned intermediate values are converted to decimal format when used in binary arithmetic operations (+, -, *, /).
INTPREC(10), the default, indicates a decimal precision of 10 digits for integer and unsigned operations. However, if at least one operand in the expression is an 8-byte integer or unsigned field, the result of the expression has a decimal precision of 20 digits regardless of the INTPREC value.
INTPREC(20) indicates that the decimal precision of integer and unsigned operations is 20 digits.