Radio Shack TRS-80 Model 4 - Page 169

• If either operand is double precision, then both are converted to
double precision and eight-byte division is performed.
•
If neither operand is double precision, then both are converted to
single precision and four-byte division
is performed.
Examples:
PRINT 3/4
single-precision division is performed.
PRINT 3.8/4
single-precision division is performed.
PRINT 3/1.2345678901234567
double-precision division is performed.
Addition
The + operator is the symbol for addition. The addition is done with
the precision of the more precise operand (the less precise operand is
converted).
For example, when one operand
is integer type and the other is
single precision, the integer
is converted to single precision and
four-byte addition is performed. When one operand is single precision
and the other is double precision, the single-precision number is
converted to double precision and eight-byte addition
is performed.
Examples:
PRINT 2 + 3
integer addition is performed.
PRINT 3.1 + 3
single-precision addition is performed.
PRINT 1.2345678901234567 + 1
double-precision addition is performed.
Subtraction
The - operator is the symbol for subtraction. As with addition, the
operation is done with the precision of the more precise operand (the
less precise operand is converted).
Examples:
PRINT 33 - 11
integer subtraction is performed.
2-41