TOPS-20 PASCAL Language Manual - Bitsavers

EXPRESSIONS
The REM operator can be used on integers of all sizes and retains the
sign of the dividend. For example, the expression 5 REM 3 returns a
value of 2, the expression (-5) REM 3 returns a value of -2; and the
ex pre s s ion 5 REM ( - 3) ret urn s a val u E~ 0 f 2.
In arithmetic expressions, PASCAL allows you to mix integers, real
numbers (single and double precision), and integer subranges. When
you assign the value of an expression to a variable, you must ensure
that the types of the variable and the expression are compatible. In
general, you can assign an integer expression to a real variable.
However, you cannot assign a real expression to an integer variable.
Table 3-2 Jists the type of the result for all possible combinations
of arithmetic operators and operands.
Table 3-2:
Result Types for Arithmetic Expressions
Operator
(Opera t ion)
Type of First
Operand
Type of Second
Operand
------.------------------------------------------------------------
** INTEGER INTEGER
( e x po n e n t i a t ion) INTEGER, REAL REAL, DOUBLE
Type of
Result
INTEGER
REAL
DOUBLE
INTEGER, REAL,
DOUBLE
DOUBLE
* INTEGER INTEGER
(mul tipl ication} INTEGER REAL
INTEGER
REAL
REJ~L
DOUBLE
RE)\L, INTEGER
INTEGER, REAL
INTEGER, REAL,
DOUBLE
DOUBLE
REAL
DOUBLE
DOUBLE
/ RE1\L, INTEGER REAL, INTEGER
(division) DOUBLE INTEGER, REAL,
DOUBLE
RE1\'L, INTEGER DOUBLE
DIV, MOD, REM INTEGER INTEGER
REAL
DOUBLE
DOUBLe
INTEGER
3-3