
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Transcribed Image Text:3. Considering the operator definition:
You are given the following operators:
+(int, int) →int (plus)
-(int, int) int (minus)
.
.
.
.
name (input1_type, input2_type,...) → output_type
&&(boolean, boolean) → boolean (and)
(boolean, boolean) → boolean (or)
(int, int)→ boolean (equality)
(boolean, boolean) → boolean (equality)
==
. ==
Note: Operator: +(int, int)→int, means it takes two integers, performs an add operation
on them, and outputs an integer.
Using the given operators, decide whether the following expressions ((a) to (e)) are typeable
or not. If the expression is typeable (able to be reduced to a typed expression), give its type
and expected output. Otherwise, give an explanation of why it is not typeable.
(a) True
(b) 10+3
(c) 6-2.1
(d) (2-1) True
(e) (4+5)= (1+7)
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