== Why is this an issue?

Calculating or retrieving a value only to then overwrite it or throw it away, could indicate a serious error in the code. Even if it's not an error, it is at best a waste of resources. Therefore all calculated values should be used.


=== Noncompliant code example

[source,html]
----
void calculateRate(int a, int b)
{
  int i;

  i = a + b; // Noncompliant; calculation result not used before value is overwritten
  i = doSomething();  // Noncompliant; retrieved value not used
  for (i = 0; i < 10; i++) { 
    //  ...
  }
  // ...
}
----


=== Compliant solution

[source,html]
----
void calculateRate(int a, int b)
{
  int i;

  i = doSomething();
  i += a + b;
  storeI(i)

  for (i = 0; i < 10; i++) { 
    //  ...
  }
}
----


ifdef::env-github,rspecator-view[]
'''
== Comments And Links
(visible only on this page)

=== duplicates: S1854

=== on 19 Sep 2014, 13:54:47 Freddy Mallet wrote:
@Ann, I would:

* Associated this rule to CWE-563: \http://cwe.mitre.org/data/definitions/563.html
* Use the SQALE "Reliability" characteristic because again when there is a potential operational risk, this is more important than anything else
* Add the tag "Bug"

endif::env-github,rspecator-view[]
