FLOAT is an arithmetic data type attribute that defines a floating-point arithmetic value. Its format is:
FLOAT[(p)]
The precision p may be supplied with this attribute or with the BINARY or DECIMAL attribute, but it cannot be specified twice. The precision p must be a positive integer. If a precision is not specified, a default precision is assumed. for information on the Open PL/I default precisions, see your Open PL/I User's Guide and the section DEFAULT in the chapter Statements.
If FLOAT is specified without BINARY or DECIMAL, DECIMAL is the default. If BINARY or DECIMAL is supplied without FIXED or FLOAT, FIXED is the default.
When used with BINARY, FLOAT specifies floating-point arithmetic values whose mantissa contains the equivalent of at least p bits.
When used with DECIMAL, FLOAT specifies floating-point arithmetic values whose mantissa contains the equivalent of at least p decimal digits.