P.2 Function Definitions and Returned Values
The definition of a function identifies the following:
- For alphanumeric functions, the size of the returned value
- For numeric and integer functions, the sign of the returned value and whether
the function is an integer
- For some other cases, the value returned
Data item functions are elementary data items and return alphanumeric,
numeric, or integer values. Data item functions are treated as elementary data items
and cannot be receiving operands. Types of data item functions are as follows:
- Alphanumeric functions--these are of the class and category alphanumeric. The
number of character positions in this data item is specified in the function
definition. Alphanumeric functions have an implicit usage of DISPLAY.
- Numeric functions--these are of the class and category numeric. A numeric
function is always considered to have an operational sign.
- A numeric function may be used only in an arithmetic expression.
- A numeric function may not be referenced where an integer operand is required,
even though a particular reference may yield an integer value.
- Integer functions--these are of the class and category numeric. A numeric
function is always considered to have an operational sign.
- An integer function may be used only in an arithmetic expression.
- An integer function can be referenced where an integer operand is required and
where a signed operand is allowed.
More:
P.2.1 Function Definitions
ACOS Function
ANNUITY Function
ASIN Function
ATAN Function
CHAR Function
COS Function
CURRENT-DATE Function
DATE-OF-INTEGER Function
DAY-OF-INTEGER Function
FACTORIAL Function
INTEGER-OF-DATE Function
INTEGER-OF-DAY Function
INTEGER-PART Function
LENGTH Function
LOG Function
LOG10 Function
LOWER-CASE Function
MAX Function
MEAN Function
MEDIAN Function
MIDRANGE Function
MIN Function
MOD Function
NUMVAL Function
NUMVAL-C Function
ORD Function
ORD-MAX Function
ORD-MIN Function
PRESENT-VALUE Function
RANDOM Function
RANGE Function
REM Function
REVERSE Function
SIN Function
SQRT Function
STANDARD-DEVIATION Function
SUM Function
TAN Function
UPPER-CASE Function
VARIANCE Function
WHEN-COMPILED Function