[[Property:title|CA020 - Variable not read after assignment]]
[[Property:link_title|CA020]]
[[Property:weight|0]]
[[Property:uuid|8de22b33-be9c-b946-ce39-709cf42f01c5]]
__NOTOC__
=Description=
An assignment to a local variable has not effect at all if the variable is not read after the assignment, or reassigned.
{| class="doctable"
|-
| '''Scope'''
| Instruction
|-
| '''Status'''
| Enabled
|-
| '''Severity'''
| Warning
|-
| '''Applicability'''
| All
|-
| '''Score'''
|  70
|}


=Example of violation=
<e>
local
	x, y: INTEGER
do
	x := 3
	y := some_height_query
	x := some_width_query
	...
end
</e>

=Recommendation=
Remove the assignment without effect.

In the example, remove the first assignment to <e>x</e>:
<e>
local
	x, y: INTEGER
do
	y := some_height_query
	x := some_width_query
	...
end
</e>

{{SeeAlso | [[CA071 - Self-comparison]]}}